ORIGINAL PAPER
Physician–patient relationship and medical accident victimcompensation: some insights into the French regulatory system
Lydie Ancelot • Cornel Oros
Received: 10 September 2013 / Accepted: 17 April 2014
� Springer-Verlag Berlin Heidelberg 2014
Abstract Given the growing amount of medical litigation
heard by courts, the 2002 Kouchner law in France has
created the Office National d’Indemnisation des Accidents
Medicaux (ONIAM), whose main aim is to encourage out-
of-court settlements when a conflict between a physician
and the victim of a medical accident occurs. More than
10 years after the implementation of this law, the statistics
analysing its effectiveness are contradictory, which raises
the question of the potential negative effects of the ONIAM
on the compensation system. In order to address this
question, the article analyses the impact of the ONIAM on
the nature of settlement negotiations between the physician
and the victim. Using a dynamic game within incomplete
information, we develop a comparative analysis of two
types of compensation systems in case of medical acci-
dents: socialised financing granted by the ONIAM and
private financing provided by the physician. We show that
the ONIAM could encourage out-of-court settlements
provided that the hypothesis of judicial error is relevant.
On the contrary, in the case of a low probability of judicial
errors, the ONIAM could be effective only for severe
medical accidents.
Keywords French insurance system �Medical accidents �Victims–physician conflict � Judicial errors
JEL Classification I13 � I18 � K32 � K41
Introduction
The compensation of victims who have suffered thera-
peutic accidents has been a constant topic of economic and
social debate in developed countries for several decades.
The issues dealing with the effectiveness, equity and
transparency of the compensations as well as the behav-
iour, incentives and responsibility of different players
involved in this process (physicians, patients, insurers,
public authorities) have not yet found any clear and per-
fectly satisfactory answers, thus justifying the use of
complex analyses at the confluence of different fields of
economics such as health economics, public economics,
and law and economics. Moreover, the development and
implementation of this type of compensation have been
changing constantly, preserving the relevance of the
debates. In the French case, for example, we have wit-
nessed a very important increase in the number of medical
litigations1 in the last 20 years, mainly at three levels. First,
the frequency of medical accidents doubled between
L. Ancelot � C. Oros (&)
IRIAF- CRIEF, University of Poitiers, 2, Rue Jean Carbonnier
Bat A1 (BP 623), 86022 Poitiers Cedex, France
e-mail: [email protected]
L. Ancelot
e-mail: [email protected]
L. Ancelot
BETA, UMR CNRS 7522, University of Strasbourg, Strasbourg,
France
L. Ancelot
BETA, UMR CNRS 7522, University of Lorraine, 13, place
Carnot, 54035 Nancy, France
C. Oros
LEO, University of Orleans, Rue de Blois - BP 26739,
45067 Orleans, France
1 As showed by Helmlinger and Martin [16], ‘‘several resounding
trials as for instance that of the infected blood or that of the growth
hormone have largely popularised the idea that medicine is also
exposed to legal investigation’’ (translation from French).
123
Eur J Health Econ
DOI 10.1007/s10198-014-0606-4
1992–1996 and 1997–2001. Second, there has been a
constant increase in the number of cases brought to court
and the development of the phenomenon called ‘‘medical
prosecution’’2 (805 medical liability claims processed in
1990 against 3,906 in 2002 according to the Annuaire
Statistique de la Justice, 2003 edition [2]). Third, the
average cost of the settlement of an insurance claim rose by
about 50 % in 1990 according to the 2002–2003 Activity
Report of the Commission de controle des assurances [8].
In order to reduce the number of trials—as well as the
costs they involve—the 2002 Kouchner law3 stipulates
facilitating negotiation, which is considered less expensive
than a trial. At the same time, the purpose of the law is to
compensate the acknowledged victims of medical acci-
dents irrespective of the existence or not of a physician’s
fault. More precisely, this law modifies the compensation
process of the victims of medical accidents and thus creates
three possibilities for compensation:
• Compensation by the physician through the premium
paid to the insurer.
• Compensation by the State through the Office National
d’Indemnisation des Accidents Medicaux (ONIAM).4
• Compensation by a hybrid system in which the insurer
and the ONIAM share the costs of compensation.
A few years after the implementation of the Kouchner
law, two important trends can be identified: an increase in
the percent of cases solved by settlement and also in the
amount of compensation incurred by the physician.5 Thus,
according to the 2010 Report of the Observatoire des
Risques Medicaux, in 2009 the out-of-court settlements
represented 70 % of the solved medical accidents with a
clear distinction according to the origin of the proposition
(98 % by ONIAM against 52 % by the physician). At the
same time, we can notice an increase in the amount of
compensation: 20.5 million euros for the ONIAM in 2006
against 88 million euros in 2009, whereas for the insurers
the figures vary from 30 million euros in 2006 to
61.5 million euros in 2009 (Report of Observatoire des
Risques Medicaux, edition 2010).
These facts raise questions about the relevance of the
Kouchner law. We can thus ask the question of the
potential negative effects that the ONIAM could generate.
Facilitating the settlements on one hand and enabling
victims to get compensation on the other may seem two
contradictory objectives. Indeed, making the settlement
easier allows for a reduction in the number of cases brought
to court,6 whereas the certainty of the compensation when
the medical accident is proved7 could encourage the vic-
tims to take legal proceedings in order to benefit from a
bigger compensation if the physician is convicted, which
thus raises the number of cases brought to court.
In order to answer this question, the aim of the article is to
propose an analysis of the physician-patient relationship by
taking into consideration the public compensation granted by
the ONIAM. We thus examine the impact of the presence of
the ONIAM on the behaviour of the physician who, according
to whether he/she is negligent or not, can choose to propose an
out-of-court settlement to the victim or not. Is not the tradi-
tional separating equilibrium supposing that the physician
will reveal his/her real type8 put into question by the presence
of this public institution? The article thus has a normative
dimension and provides support for the public authorities in
the decision-making process by studying the effects of the
two possible compensation types in case of medical acci-
dents: the public state funding by the ONIAM and the private
funding via the physician’s insurance company.
The first section of the article briefly presents the
functioning of the ONIAM. The second section presents
the model that we have used and describes the strategies
and payoffs of the players. The third section presents the
different Bayesian equilibriums identified and provides a
comparative analysis of physicians’ incentives to propose a
2 Helmlinger and Martin [16], Naatowicz-Laurent [22], Kouchner
et al. [18], Lecocq et al. [20].3 The 2002-303 law from 4 March 2002 relative to the patients’
rights and to the quality of the health system.4 ONIAM was created in the context of the Kouchner law in 2002
and can be considered as a substitute for the insurers. It intervenes
when a medical accident occurs if the responsibility of the physician
is not recognised, i.e. lack of medical malpractice liability or if there
is no proposal for out-of-court settlement by the insurer. The creation
of ONIAM is specifically French, but other European countries
(mainly Germany, the UK, Denmark, Sweden and Italy) have
developed a similar approach trying to encourage out-of-court
settlements when medical accidents occur. As mentioned by the
Senate Report in November 2000 [25], ‘‘the analysis of the systems of
medical accident compensation puts forward that except Italy, all the
analysed countries have developed specific procedures allowing the
victims of medical accidents to obtain a compensation without going
to court’’ (translation from French). This report also describes the
specific procedures implemented in each country.5 Inspection Generale des Affaires Sociales (2007): ‘‘contrary to what
was feared, there has been no important rise in the number of
complaints as a consequence of the introduction of an obligation to
inform the patient or of the creation of CRCI (Commission Regionale
de Conciliation et d’Indemnisation)’’ (translation from French).
Report of the Office National d’Indemnisations des accidents
medicaux (2010): ‘‘the number of medical litigations handled by the
legal system has remained stable, i.e. around 7,000 new cases each
year throughout all jurisdictions’’ (translation from French).
6 The risk with ONIAM is that some conflicts may not be brought to
court where the judge could award a better compensation to the
victim. Another risk is that in the absence of court judgments, we may
lack references relative to similar conflicts [29].7 We will later see that the presence of ONIAM implies that the
victim is always compensated if a medical accident is proved,
whether the physician is negligent or not.8 The guilty agent recognises his/her negligence, whereas the not
guilty agent declares him/herself not negligent [5].
L. Ancelot, C. Oros
123
settlement to the victim according to the existence or not of
the ONIAM.
The role and functioning of the ONIAM
Given the fact that our article aims at analysing the impact
that the ONIAM could have on the nature of the physician–
patient relationship, a description of the operating princi-
ples of the ONIAM will provide a better grasp of our
institutional framework.
Traditionally, before the creation of the ONIAM, there
were two ways for victims of medical accidents to obtain
compensation9:
• A direct settlement between the physician and the victim.
Once the victim has made the complaint, the physician
makes a compensation offer on his/her insurer’s advice.
The victim can accept the proposal or not.
• A decision by the court stipulating the compensation of
the victim. This case occurs when the physician does
not make any settlement offer or if the victim refuses
the offer made by the physician, thus deciding to go to
court. If the physician is found guilty, he/she will be
convicted as negligent and his (her) insurer will have to
pay compensation.
The 2002 Kouchner and About laws introduced an
additional way to compensate the victims of medical
accidents.10 Two innovative principles characterise this
compensation alternative:
• It admits that a medical accident may be generated by a not
negligent act. In this case, the medical accident is
recognised but the physician is not considered negligent.11
and the victim’s compensation is paid by the ONIAM.
• The victim is always compensated if the medical
accident is proved.
The topic of our article is in line with this alternative
compensation whose operating mechanisms can by summa-
rised as follows. The persons who consider themselves victims
of medical accidents can refer to a regional commission, i.e. the
Commission Regionale de Conciliation et d’Indemnisation
(CRCI), in order to obtain compensation. The role of the CRCI
is to encourage the out-of-court settlement of conflicts and to
Complaint against the physician made by the victim of a medical accident
The physician makes an offer on the insurer’s advice
The physician does not make any offer on the insurer’s advice
The victim accepts the proposal =
compensation
The victim refuses the proposal
The physician is convicted = total compensation for the victim = negligence rule
The physician is acquitted = lack of compensation for the
victim = the medical error is not recognized
Changes generated by the Kouchner and About laws
1. It is admitted that the act may not be negligent.
2. The victim is always compensated if the medical accident is proved.
Court
The physician is convicted = total compensation for the victim =
negligence rule
The physician is acquitted = compensation paid by ONIAM = strict
liability
The physician is partially convicted = compensation paid by the physician’s insurer and by ONIAM: impossibility to prove the complete negligence of
the physician
Fig. 1 Ways of compensation for the victims of medical accidents
9 We thank the referee for suggesting this description.
10 See Fig. 1 for a synthetic description of the different ways for a
victim of medical accidents to obtain compensation.11 For instance, we can mention iatrogenic infections.
Physician–patient relationship
123
allow compensation to the victims whose damage presents a
degree of severity that is superior to a legal threshold.
If the request is admissible,12 the Commission will
transfer the case to an expert who will conduct an inves-
tigation.13 The Commission has 6 months from the date of
receipt of an admissible request to deliver its judgement on
the circumstances, the causes and the amount of the dam-
age suffered by the victim.
If the Commission recognises the existence of a right to
compensation, it will name the agent who will pay the com-
pensation, either the physician’s insurer if the physician is
considered as negligent or the ONIAM in the case of strict
liability.14
The designated agent has to present a compensation
offer to the victim within 4 months according to the indi-
cations provided by the CRCI. In practice, it is possible that
the physician’s insurer does not answer or refuses to make
a compensation offer to the victim. In this case, the victim
can choose to go to court but he/she also has the possibility
to make a demand requesting that ONIAM replaces the
deficient insurer.15 If ONIAM accepts the demand, it can
pursue the physician afterwards.
The model
The model that we develop falls within the scope of two
important types of microeconomics models: the bargaining
models with asymmetric information [19] applied to health
problems [21] on the one hand and the economic analysis
of law and economics on the other hand.
The literature on bargaining games with asymmetric
information in health economics is quite vast, which is
mainly due to the multiplicity of actors generating the
analysis of a large number of strategic behaviours.16 In this
context, our model aims to examine the impact on the
physician–patient relationship of the presence of the public
regulatory authority specific to the French system of
compensation, namely the ONIAM. Beyond the introduc-
tion of this specific public actor, the originality of our
framework is based on the fact that the physician-patient
relationship is developed in the context of a legal dispute
between these two actors.17 Thus, both of the models used
in the resolution of legal disputes and of the models ana-
lysing the role of information asymmetries in health sys-
tems being close,18 our own model examines the
effectiveness of the impact of the ONIAM on the devel-
opment of the out-of-court settlements.
The methodology uses game theory tools and involves
the construction of a dynamic game model with incomplete
information between two players: the physician and the
victim. The judge is also present in our model and influ-
ences the conviction or not of the physician, the behaviour
of the latter and of the victim through his/her decision.
When the case is referred to the judge, we consider that the
latter may commit two types of judicial errors: (1) declare
the physician guilty when he/she is not negligent or (2)
declare the physician not guilty when he/she is negligent.
Our approach is in line with P’ng’s model [24] sup-
posing a signaling model where the informed party (the
physician) makes an offer to a non-informed party (the
victim). Nevertheless, our model is different as we consider
the hypothesis of a lack of perfect information from the
judge, thus generating the potential existence of the two
judicial errors (type 1 and 2) previously mentioned.19
We chose to focus only on the physician-patient relation-
ship and thus to ignore the role of the physician’s insurer in the
victim compensation process. As we have already indicated,
the insurer plays a technically specific role in the compensation
process mainly by paying the compensation when the judge or
the CRCI declare the physician negligent. Nevertheless, in
practice, the exact type of these compensations and thus the
role of the insurer in this process are very heterogeneous and
complex depending essentially on the specific nature of the
contract between the insurer and the physician, specificity that
depends on the physician’s specialty. The latter highly
12 The request is admissible if the medical procedure generating the
accident took place after September 2001 and if it generated damage
that is superior to a threshold fixed by the law.13 The expert investigation is free of charge for the victim.14 We could draw a parallel with the 1985 Badinter law for traffic
accidents within a system of strict liability. This law creates an
obligation for the insurers to make an offer to the victims. In this type
of conflict, only the most severe injuries or the most complex cases go
to court.15 We can thus conclude that the ONIAM has two main objectives.
First, it generates a victim compensation process when the physician
is not negligent. Second, it represents a substitute to the negligent
physician if he/she does not make an offer.16 Rochaix [26] provides a survey of the literature and presents the
various strategic behaviours that can be analysed in health economics.
The articles of Bejean and Gadreau [6] and Bejean et al. [7] describe
the specific relationships that could be identified among the different
regulatory authorities (health insurance system, government), insurers
(private and public) and thealth care providers (hospitals, physicians,
pharmacists, etc.).
17 The economic analysis of the legal system draws a distinction
between two main categories of models [14]: the screening models [5]
and signal models [13, 28]. It has grown in popularity as a result of
the implementation of alternative dispute resolution. This field of
research aims to study the effectiveness of legal rules and to provide
innovative measures allowing improving the current juridical system.18 Our approach refers also to the literature about medical malprac-
tice. For some important references on the topic, see for instance
Danzon and Lillard [12], Danzon [9–11].19 Contrary to the P’ng [24] model, we do not take the existence of
the nuisance suits explicitly into consideration, supposing that the
victim’s expected gain from the legal proceedings could be inferior to
his/her cost.
L. Ancelot, C. Oros
123
influences both the number of compensated cases and amount
of the compensation.20 Moreover, the insurance system itself
can generate important compensation heterogeneities. Certain
specialties pay very important premiums because in case of a
medical error, the compensation amount cannot be covered
only by the physician and an intervention of the insurance is
thus necessary.21 An important distinction thus exists between
the full insurance and the co-insurance: the insurer has a par-
ticularly important role in the compensation process only when
the physician benefits from a full insurance contract. On the
contrary, the role of the insurer becomes relatively less
important for the co-insurance contracts. At the same time, the
status of the physician (professional of a public or private
sector) highly influences the type of the liability and thus the
compensation.22
Another element leading us to ignore the physician’s
insurer relies on the specificity of ONIAM as a public
institution specialised in the compensation of the victims of
medical accidents. Indeed, as we have already mentioned,
the physician’s insurer is a central player in the resolution
of the medical conflicts for which the physician’s respon-
sibility is recognised. On the contrary, as the presence of
the ONIAM is justified by the potential existence of the
physician’s strict liability, the role of the physician’s
insurer is consequently relatively less important.23
In the context of a medical compensation system that is
particularly complex, involving a large number of actors [health
institutions (public or private), health professionals, insurers,
medical experts, victims] and taking into consideration that the
objective of the article is to analyse the potential impact of the
creation of a public compensation institution on the physician’s
behaviour, the role of the insurance is thus isolated in order to
focus on the physician–patient relationship.24
The game is developed according to the following steps:
1. The physician is negligent or not. This characteristic
represents his/her type.
2. The physician knows perfectly his/her type and decides
to propose or not a settlement to the victim. The
negligent physician proposes a settlement with a
probability bN, whereas the non-negligent physician
proposes a negotiation with a probability bN .
3. The victim decides to accept or not the settlement
proposed by the physician. The victim accepts with a
probability cN when he/she considers that the physician is
negligent. On the contrary, when the victim considers
that the physician is not negligent, he/she accepts the
arrangement with a probability cN . The victim’s a priori
beliefs on the type of the physician are the following: the
physician is negligent with a probability a and non-
negligent with a probability 1 - a.
4. If the victim accepts, the case is closed.
5. If the victim refuses the settlement, the case is brought to
court, and the judge decides to convict the physician or
not.25 The judge may commit judicial errors (type 1 or 3)
and the negligent physician is acquitted or convicted with
a probability (1 - pN) or (pN). The non-negligent physi-
cian is convicted or acquitted with a probability (pN) or
(1� pN). Concerning the relationship between these
probabilities, we have pN [ pN , which means that the
probability for a physician to be convicted is higher when
he/she is negligent than when she (he) is not negligent.
The payoffs of the players are the following:
D amount of the compensation if the victim accepts the
settlement. Taking into account that our approach
ignores the presence of the insurance and focusses
exclusively on the physician–patient relationship, we
consider that the compensation proposal is made
directly by the physician. In this case, if the victim
accepts, the amount of this compensation will be
entirely incurred by the physician. 26
20 According to the Observatoire des Risque Medicaux [23] for the
period 2006–2009, the surgical disciplines represented 59.4 % of the
compensated cases, which corresponds to 280 million euros. Anaes-
thesia, resuscitation, emergency and regulation procedures represent
6.4 % of the compensated cases, which corresponds to 41 million
euros.21 We can mention for instance the important differences between the
premiums paid by a general practitioner and by an obstetrician-
gynecologist.22 According to the Observatoire des Risques Medicaux [23], in
private health institutions, it is the liability of the practitioners that is
largely questioned (58 % of cases for all the private institutions),
whereas in public health institutions, it is the institution itself (more
than 90 % of cases).23 An interesting extension of our model could be to consider a different
framework supposing that the proposal is made either by the insurer or by
ONIAM according to whether the case is initially considered as a
negligent or not negligent act. The victim’s incentives to accept or refuse
the offer could thus be different according to the origin of the offer.24 The Kouchner law implementing the ONIAM insists on the role of the
physician in the physician-patient relationship and imposes an obligation
for the physician to inform the patient about his/her medical file.
25 The game is identical regardless of the presence or not of the
ONIAM. The differences concern the players’ payoffs.26 When there is an insurance, the proposal will be made by the insurer on
behalf of the physician. In this case, the insurance can cover the
compensation if the victim accepts the proposal. The type of this proposal
depends on the nature of the contract between the insurer and the
physician. It is thus particularly difficult given the complexity and the
diversity of these contracts to be able to capture a representative insurer-
physician relationship in order to explicitly formalise it in our model.
Moreover, if we consider that it is the insurer who makes a proposal to the
victim and pays it, the physician–patient relationship, which we aim at
focussing on in our article, will be biased as it will be highly conditioned
by the nature of the contract between the insurer and the physician.
Physician–patient relationship
123
D amount of the compensation of the victim if he/she
refuses the settlement in the case in which the
physician is convicted.
DI amount of the compensation paid by the physician if
the victim refuses the settlement and if the physician
is convicted (in presence of the ONIAM).
CV cost supported by the victim who goes to trial if there
is no settlement proposal.
CV cost incurred by the victim if he/she decides to go to
trial and refuses the proposal.
CM cost of the trial incurred by the physician if he/she
makes a proposal.
CM cost of the trial incurred by the physician in case of
lack of proposal.
DIamount of the compensation paid by the physician if
he/she did not make any proposal and is convicted by
the judge (in presence of the ONIAM).
The Table 1 sums up all the payoffs both for the phy-
sician and the victim according to the presence or the lack
of the ONIAM:
Concerning the payoffs of the players, several assump-
tions must be taken into account:
If ONIAM is not present, we consider that:
• the judge does not intervene to impose sanctions on the
physician who did not make any proposal. Conse-
quently, the compensation D paid to the victim is the
same when the physician is convicted whether the latter
made a proposal or not. On the contrary, his/her trial
costs are different: the fact of making a settlement
proposal implies an additional cost accounted for by the
existence of a supplementary step in the conflict
resolution. We thus have: CM [ CM .
• the trial costs charged to the victim are more important
if he/she refuses the proposal and goes to trial:
CV [ CV . Our approach takes into consideration the
French rule of allocation of litigation costs (‘‘regle de
condamnation aux depens’’), according to which the
loser pays a part of the winner’s litigation costs. Indeed,
the convicted physician pays the victim’s litigation
costs.
• the compensation paid by the physician is more
important when there is no settlement (D [ D). We
follow here the principle of an out-of-court settlement
supposing that the sanction (compensation and trial
costs) is always less important in the case of a
settlement than in the case of a trial.
In the presence of the ONIAM, the specificity of the
hypothesis concerns the following elements:
• the presence of the ONIAM does not influence the
physician payoffs when the latter is convicted after
having made a proposition (DI ¼ D). Indeed, since the
physician makes a proposal, we consider that a higher
degree of sanction is not appropriate.27
• when the physician is convicted, the monetary costs he/
she incurs are identical between the situation supposing
the presence and the lack of the ONIAM. Indeed, we
consider that the financial burden incurred by the
physician in order to prove its innocence is identical
regardless of the nature of the defence, i.e. in front of
the victim’s lawyer or in front of the ONIAM.
• if the physician is acquitted, his/her payoff is zero
when the ONIAM is present, which means that the
public authority bears the trial costs in this case.
The explanation is based on the fact that if the
physician is acquitted, the victim did not have to
take legal proceedings and consequently the physi-
cian will not incur any costs. The ONIAM plays a
protective role here with regard to the physician by
paying the trial costs when the physician is not
convicted.
• the French rule of allocation of litigation costs (‘‘regle
de condamnation aux depens’’) is applied, and the
victim bears the costs of the trial only when the
physician is acquitted28 whereas the convicted physi-
cian pays for the victim’s litigation costs.
We consider that all these variables that influence the
payoffs of the players are exogeneous.
The Kuhn tree (extensive form game) is described in
Fig. 2 (the payoffs in the case where the ONIAM is not
present are represented on the first line, whereas the dif-
ferences between the payoffs generated by the presence of
ONIAM are represented on the second line).
Equilibrium of the game
We will identify the Bayesian equilibriums of the game
according to the presence or not of the ONIAM. Even if our
approach is close to the signalling models proposed by
P’ng [24], a major distinction compared to this model
concerns the manner of analysing the game equilibriums.
Our objective is not to identify all the equilibriums of the
game (pure and mixed strategies) but to analyse the impact
on the equilibrium physician’s behaviour of the existence
27 We will see further on that ONIAM has the possibility to sanction
the physician more severely when he/she did not make any proposal
as this behaviour is inconsistent with ONIAM’s objective of
developing a settlement agreement.28 The victim bears the costs of the trial when the physician is
acquitted regardless of the physician’s decision (i.e. to propose a
settlement or not). This hypothesis is justified by the fact that the
victim is the first actor to take legal proceedings.
L. Ancelot, C. Oros
123
or not of a public compensation institution (ONIAM). This
is the reason why we have identified the conditions
allowing the existence of a benchmark equilibrium (sepa-
rating equilibrium) and analysed the evolution of this
equilibrium according to the two configurations.29 A
modification of the benchmark equilibrium according to
the presence or not of the ONIAM allows capturing the
nature of the modification of the physician’s behavior in a
relatively easy manner.
Game configuration when the ONIAM is not present
We take as a reference a specific separating equilibrium
supposing that contrary to the negligent physician, the non-
negligent physician does not make any proposal. This
hypothesis seems relevant as it is more advantageous for a
negligent physician to compensate the victim following an
out-of-court settlement that is less costly (in terms of
compensation and legal fees) compared to a trial convicting
the physician. On the contrary, the non-negligent physician
does not have to make any proposal and thus goes to trial in
order to prove his/her innocence.
This situation will be used as a benchmark allowing to
compare the different strategies of the players according to
the specific game configuration, i.e. with/without ONIAM.
The conditions that allow this type of behaviour on the
part of the physician are the following:
The non-negligent physician does not make a proposal:
�pN Dþ CM þ CV
� �� CM 1� pN
� �[ � cND
� 1� cN
� �ðDþ CM þ CVÞpN þ CM 1� pN
� �� �:
We thus have:
D [ pN Dþ CV
� �þ CM �
pN CV � CV
� �þ CM � CM
cN
¼ A:
The negligent physician makes a proposal:
� cND� 1� cNð Þ Dþ CM þ CV
� �pN þ CM 1� pNð Þ
� �
[ � pNðDþ CM þ CVÞ � CM 1� pNð Þ:
We thus have:
Fig. 2 The extensive form of the game
29 A close approach developing a bargaining model with asymmet-
rical information and supposing an initial separating equilibrium is
proposed by Baker and Mezzetti [3]. We can thus identify a
difference compared with the results of P’ng [24] who, according to
the parameters of its model, has identified only pooling equilibriums.
In our approach, the existence of a separating equilibrium used as a
benchmark in order to compare the physician’s incentives to make a
proposal according to the presence or not of the ONIAM does not
exclude the existence of pooling equilibriums.
Physician–patient relationship
123
D\pN Dþ CV
� �þ CM �
pN CV � CV
� �þ CM � CM
cN
¼ B:
The victim accepts the proposal if:
p NNjPð ÞDþ p NjPð ÞD [ p NNjPð Þ pND� 1� pN
� �CV
� �
þ p NjPð Þ pND� ð1� pNÞCV
� �:
We obtain:
D [ p NNjPð ÞðDþ CVÞ pN � pN
� �þ pND� ð1� pNÞCV
p NjPð Þ\T ¼Dþ 1� pN
� �CV � pND
ðDþ CVÞ pN � pN
� � :
When we have a separating equilibrium, the negligent
physician makes a proposal (p NjPð Þ ¼ 1) and the behav-
iour of the victim can thus be analysed. The victim refuses
the proposal if Dþ CV\pN Dþ CV
� �) Dþ ð1� pNÞ
CV\pND, which implies a relatively low value for CV
because we have D\D. This strategy is not compatible
with the physician’s strategy and consequently the game
equilibrium is not stable in this case.
On the contrary, the acceptance is optimal for the victim
if Dþ CV [ pNðDþ CVÞ ) Dþ ð1� pNÞCV [ pND. We
observe that the victim’s switching toward an acceptance
strategy is conditioned by the costs of the trial (CV ), which
becomes a crucial factor for the stability of the equilib-
rium.30 When the trial costs incurred by the victim are
relatively high as well as the probability of the judicial
error of type 2 (pN low), negotiation is encouraged even if
the compensation is bigger when the victim obtains it
following a trial. We can thus raise the question of the
effect of the ONIAM on the negotiation when the victims
do not incur the trial costs (the case of the agents who are
subject to legal proceedings and who benefit either from
the legal aid or from the legal expenses insurance).
According to the literature,31 there is a bigger probability
of refusal from the individuals benefitting from the
reduction of their trial costs because of the presence of
ONIAM.
The victim’s acceptance strategy is compatible with the
physician’s behaviour if the two following conditions are
satisfied:
D [ pNðDþ CVÞ þ CM ) pN\D� CM
Dþ CV
D\pNðDþ CVÞ þ CM ) pN [D� CM
Dþ CV
:
The acceptance by the victim thus insures the stability of
the separating equilibrium whose strategies are:
sMðNNÞ; sMðNÞ; sV� �
Without ONIAM
¼ sMðNNÞ ¼ No Proposal; sMðNÞ ¼ Proposal;sV ¼ Accepts
� �:
Game configuration when the ONIAM is present
We keep the separating equilibrium as a benchmark suppos-
ing that the non-negligent physician does not make a proposal:
D [ pN Dþ CM þ CV
� �
þ pN
cN
DI � D� CM � CM
� �� CV � CV
� �h i¼ A0
contrary to the negligent physician who makes a
proposal:
Table 1 The physician and the
victim’s payoffs according to
the presence or the lack of the
ONIAM
Situation Without ONIAM With ONIAM
Victim payoff Physician payoff Victim payoff Physician payoff
Victim accepts settlement D -D D �D
Victim refuses settlement,
the physician is convictedD - Dþ cM þ cV
� �D � DI þ cM þ cV
� �
Victim refuses settlement, the
physician is acquitted
�cV �cM �cV 0
Lack of proposition and
discharge of the physician
-cV �cM -cV 0
Lack of proposition and
conviction of the physicianD � Dþ cM þ cV
� �DI � DI þ cM þ cV
�
30 We notice that the acceptance by the victim can also be explained
by the existence of a type 2 judicial error supposing that the
responsible physician is acquitted (pN\1). Thus, the higher the
probability of this erroris (pN goes down), the higher the victim’s
incentive to accept the physician proposal. Indeed, faced with the risk
of undergoing a judge’s wrongful decision, which diminishes
compensation by acquitting the responsible physician, the victim
prefers to accept the physician’s proposal.
31 Indeed, as shown by the literature on public aid [1], [4], [15], [17]],
[27], the persons subject to legal proceedings are encouraged to go to
trial by refusing the proposal from the accused as their trial costs are
paid by the insurer but also because the assistance received could
represent a credible threat.
L. Ancelot, C. Oros
123
D\pN Dþ CM þ CV
� �
þ pN
cN
DI � D� ðCM � CMÞ � CV � CV
� �h i¼ B0:
Concerning the behaviour of the victim, the acceptance
condition is the same as in the case of the game without
ONIAM:
p NNjPð ÞDþ p NjPð ÞD [ p NNjPð Þ pND� 1� pN
� �CV
� �
þ p NjPð Þ pND� ð1� pNÞCV
� �:
We thus have:
p NjPð Þ\T ¼Dþ 1� pR
� �CV � pND
Dþ CV
� �pN � pN
� � :
The acceptance by the victim is compatible with the
separating equilibrium if:
D [ pNðDI þ CM þ CVÞ ) pN\D
DI þ CM þ CV
D\pN DI þ CM þ CV
� ) pN [
D
DI þ CM þ CV
:
As in the previous case, the decision of the victim to
refuse the proposal is not compatible with the physician’s
strategies described by the separating equilibrium.
The separating equilibrium is thus the same as that
identified in the case when the ONIAM is not present:
sM NNð Þ; sM Nð Þ; sV� �
ONIAM
¼ sM NNð Þ ¼ No Proposal; sM Nð Þ ¼ Proposal;
sV ¼ Accepts
� �:
Using the equilibriums previously identified, we develop
a comparative analysis of the behaviour of the physician
according to the presence or the absence of the ONIAM.
Taking as a benchmark the separating equilibrium allowing
the physician to reveal his/her real type, we compare the
relative position of the thresholds A, B, A0, B0, which define
the separating equilibriums for the two situations (pre-
sence/lack of the ONIAM). If we take into consideration
the fact that the separating equilibriums are unstable when
the victim refuses the settlement, we only analyse the sit-
uation supposing the acceptance from the victim
(cN ¼ cN ¼ 1). In this context, the comparison supposes:
A vs A0 , CM 1� pN
� �vs pNðDI � DIÞ
B vs B0 , CM 1� pNð Þ vs pNðDI � DIÞ:
The relative position of these thresholds is conditioned
by the distinction existing when the ONIAM is present
between the payoff of the physician when he/she makes a
proposal and is convicted (DI) and the payoff when the
physician is convicted without making any proposal (DI).
We can thus identify two configurations according to the
guidance provided by the public authorities to the role of
the ONIAM.
A. DI �DI : the ONIAM pays a part of the compensation
because the responsibility of the physician is not
entirely proved by the judge.
B. DI\DI : the ONIAM penalises the physician who does
not make any settlement proposal more severely.
The comparative analysis of the equilibriums is done
according to the relative position of variable D (amount of
the compensation of the victim if he/she accepts the set-
tlement) compared to the thresholds A, B, A0 and B0. Var-
iable D is considered exogeneous as in our model we
analyse the role of the public authorities in developing the
out-of-court settlement. In this case, the physician is free to
propose a settlement or not, but does not have the possi-
bility to influence the amount of the compensation pro-
posed. To put it differently, the amount proposed by the
physician depends on the damage incurred by the victim,
this amount being defined by the legal framework.32
The ONIAM pays a part of the compensation
This case corresponds to a subsidy provided by the public
authorities to the physician whose responsibility is not
entirely proved. We have decided to analyse this situation
as one of the roles of ONIAM is to pay to the victim a part
of the compensation in the case of strict liability.
Taking into consideration the hypothesis defining this
configuration, we have A [ A0 and B [ B0.We can thus identify three intervals of analysis.
a. D 2 ðA0; AÞ implying a pooling equilibrium with a
proposal from the physician in the case where the
ONIAM is not present and a separating equilibrium in
the case with ONIAM.
b. D 2 ðA; B0Þ implying a separating equilibrium
regardless of the presence of the ONIAM or
not.33
c. D 2 ðB0; BÞ implying a separating equilibrium in the
case where the ONIAM is not present and a pooling
equilibrium without a proposal when ONIAM is
present.
These three intervals are represented in the figure below:
32 ONIAM has created a reference system that gives the guidelines
applied for the compensation of the victim according to the type of
damage suffered (http://www.oniam.fr/infos-et-documents/referen
tiels-d-indemnisation/).33 This case implies the same type of separating equilibrium
according to the presence/lack of ONIAM. This does not allow
refining our comparative analysis relative to the two other configu-
rations and consequently will not be developed here.
Physician–patient relationship
123
When D rises and moves from A0 to B, the physician’s
incentive to avoid the proposal rises. At the same time, for
a given value of D, the physician’s incentive to avoid the
proposal is more important when ONIAM is present
compared to the situation when ONIAM is absent. To put it
differently, D can be interpreted here as a threshold con-
sidered as acceptable by the physician to make a proposal.
This threshold is smaller in the presence of ONIAM, which
thus reduces his/her incentive to propose. A moral hazard
problem can thus appear because of the presence of ON-
IAM34 as the negligent physician is encouraged to avoid
the proposal and thus conceal his/her real type.
In the first configuration, the separating equilibrium with
ONIAM is:
sM NNð Þ; sM Nð Þ; sV� �
ONIAM
¼ sM NNð Þ ¼ No Proposal; sM Nð Þ ¼ Proposal;
sV ¼ Accepts
� �:
The pooling equilibrium in the case without ONIAM is
described by the following strategies:
sM NNð Þ; sM Nð Þ; sV� �
WithoutONIAM
¼ sM NNð Þ ¼ Proposal; sM Nð Þ ¼ Proposal;
sV ¼ Accepts
� �
if Dþ CV [ D apN þ ð1� aÞpN
� �or
sM NNð Þ; sM Nð Þ; sV� �
WithoutONIAM
¼ sM NNð Þ ¼ Proposal; sM Nð Þ ¼ Proposal;sV ¼ Refuses
� �
if Dþ CV\ D apN þ ð1� aÞpN
� �:35
In the third situation, the separating equilibrium in the
case where the ONIAM is not present is written as follows:
sM NNð Þ; sM Nð Þ; sV� �
WithoutONIAM
¼ sM NNð Þ ¼ No Proposal; sM Nð Þ ¼ Proposal;sV ¼ Accepts
� �
whereas the pooling equilibrium supposing the lack of a
proposal by the physician when the ONIAM is present is
given by:
sM NNð Þ; sM Nð Þ; sV� �
ONIAM
¼sM NNð Þ ¼ No Proposal; sM Nð Þ ¼ No Proposal;
sV ¼ Accepts
� �
if Dþ CV [ D apN þ ð1� aÞpN
� �.
In this first configuration, which supposes that the ON-
IAM pays a part of the compensation, the settlements are
not encouraged by the presence of the ONIAM. Thus, the
objective of the public authorities to encourage the out-of-
court settlements through the ONIAM is not achieved.
The intuition of this result relies on the fact that the trial
sanction is reduced by the subvention provided to the
physician who becomes more tempted to go to court, tak-
ing the risk of being convicted. His/her incentives to make
a proposal will be thus reduced.
The ONIAM sanctions the lack of a proposal more severely
In this configuration, the objective of the ONIAM to
develop the negotiation is clearly put forward. We can
identify three distinct situations that allow us to refine the
analysis of the role of the ONIAM.
1. A \ A0 and B \ B036
We thus have:
CM 1� pN
� �\pNðDI � DÞ
CM 1� pNð Þ\pNðDI � DÞ:
A B
A’ B’
Without ONIAM
With ONIAM
PoolingProposal
Separating PoolingLack of Proposal
D
D PoolingProposal
Separating PoolingLack of Proposal
34 This moral hazard problem can be identified on the segment B0B of
the above diagram.35 Contrary to the separating equilibrium, the rejection of the
proposal by the victim is a strategy that is compatible with the
physician’s behaviour in the case of a pooling equilibrium. Never-
theless, our comparative analysis is concerned with the physician’s
behaviour whose benchmark is the separating equilibrium. Thus, even
in the case of pooling equilibriums, we will retain only the acceptance
strategies from the victim as solution.
36 Condition A \ A0 implies B \ B0. It is thus impossible to have the
case A \ A0 and B [ B0.
L. Ancelot, C. Oros
123
In order to verify the condition A \ A0, we must have
pN [ 0. This latter condition implies the existence of a
type 1 judicial error, triggering the conviction of the non-
negligent physician.
In this configuration, we can identify three analysis
intervals represented as follows:
a. D 2 ðA; A0Þ implying a separating equilibrium in the
case where the ONIAM is not present, associated with
a pooling equilibrium with a proposal when the
ONIAM is present.
b D 2 A0;Bð Þ supposing a separating equilibrium with-
out and with the ONIAM.
c. D 2 ðB; B0Þ supposing a pooling equilibrium without
a proposal from the physician when the ONIAM is not
present and a separating equilibrium with the ONIAM.
For the first configuration, the separating equilibrium in
the case where the ONIAM is not present corresponds to
the strategies previously identified:
sM NNð Þ; sM Nð Þ; sV� �
WithoutONIAM
¼ sM NNð Þ ¼ No Proposal; sM Nð Þ ¼ Proposal;sV ¼ Accepts
� �
whereas the presence of the ONIAM generates the fol-
lowing equilibrium strategies:
sM NNð Þ; sM Nð Þ; sV� �
ONIAM
¼ sM NNð Þ ¼ Proposal; sM Nð Þ ¼ Proposal;
sV ¼ Accepts
� �
if Dþ CV [ D apN þ ð1� aÞpN
� �.
The presence of the ONIAM encourages the physician to
make a proposal that corresponds to the objective pursued by
the public authorities. Nevertheless, this type of behaviour
from the physician depends on the judicial error of type 1, i.e.
‘‘conviction of an innocent’’ (pN [ 0) and not only on the
existence of a more severe sanction in the case of a lack of
proposal. Indeed, the results point out that the non-negligent
physician, knowing that the justice may wrongly convict him/
her, always prefers to make a proposal in the presence of the
ONIAM, thus avoiding a more important sanction. In this case,
the ONIAM can be seen as an entity that replaces a failing
judicial system, thus allowing reducing the sanctions wrongly
imposed on the non-negligent physician.
In the case of the third situation, the pooling equilibrium
in the case where the ONIAM is not present becomes:
sM NNð Þ; sM Nð Þ; sV� �
WithoutONIAM
¼ sM NNð Þ ¼ No Proposal; sM Nð Þ ¼ No Proposal;sV ¼ Accepts
� �
if
Dþ CV [ D apN þ ð1� aÞpN
� �:
In the presence of ONIAM, the separating equilibrium is
written as:
sM NNð Þ; sM Nð Þ; sV� �
ONIAM
¼ sM NNð Þ ¼ No Proposal; sM Nð Þ ¼ Proposal;
sV ¼ Accepts
� �:
In this case, the physician’s incentive to avoid the pro-
posal is relatively more important in the case where the
ONIAM is not present. The comparative analysis relative
to case A allows us to observe that the economic policies
can make the ONIAM effective even if there are not any
judicial errors. Indeed, the supplementary sanction
imposed by the ONIAM on the physician who avoids the
proposal encourages the negligent physician to make a
proposal, whereas without the ONIAM, other things being
equal, this type of physician would not make any proposal.
2. A [ A0 and B [ B0
We find the same results as in the case A showing the
ineffectiveness of the ONIAM, which did not encourage the
settlements. Nevertheless, in case A, the lack of incentives to
make a proposal was based on the subsidy provided by the
ONIAM to the convicted physician, whereas here the role of
the ONIAM is different and aims at further sanctioning the
A B Without ONIAM
With ONIAM
D
PoolingProposal
Separating PoolingLack of Proposal
A’ B’
PoolingProposal
Separating PoolingLack of Proposal
D
Physician–patient relationship
123
lack of proposal (DI\DI). To put it differently, even when
implementing an explicit policy to fight against the lack of a
proposal, the presence of the ONIAM turns out to be coun-
terproductive as it does not encourage negotiations.
This case relies also on the existence of a judicial error,
i.e. the type 2 error, supposing that the negligent physician
could be acquitted (pN \ 1).37
In this configuration, the fact that the negligent physi-
cian could be acquitted implies the lack of effectiveness of
the ONIAM, as the incentive for the negligent physician to
make a proposal is reduced (compared to the case where
the ONIAM is not present). More precisely, the negligent
physician avoids proposing and accepts the risk of a sup-
plementary sanction as he/she is counting on a judicial
error, indicating his/her false innocence, whereas the same
physician would make a proposal if the ONIAM were
absent.
3. A C A0 and B \ B0
This situation is interesting because it is no longer
conditioned by the existence of a judicial error. Indeed, the
condition A [ A0 does not imply that the non-negligent
physician is convicted (pN [ 0). On the contrary, the more
correct the decision of the judge (pR goes down), the higher
the probability is to have A [ A0. In the same way, the
condition B \ B0 excludes the possibility to acquit the
negligent physician (pN \ 1). In contrast, the more correct
the decision of the judge (pN rises) is, the higher the
probability to have B \ B0.The differences between the configurations with and
without the ONIAM are represented below:
The configurations are:
a. D 2 ðA0; AÞ implying a pooling equilibrium with a
proposal if the ONIAM is not present and a separating
equilibrium with the ONIAM.
b. D 2 ðA; BÞ supposing a separating equilibrium
regardless of the presence or not of the ONIAM.
c. D 2 ðB; B0Þ supposing a pooling equilibrium without
a proposal if the ONIAM is not present associated with
a separating equilibrium with the ONIAM.
For the first configuration, we can identify the separating
equilibrium when the ONIAM is present:
sMðNNÞ; sMðNÞ; sV� �
ONIAM
¼ sMðNNÞ ¼ No Proposal; sMðNÞ ¼ Proposal;
sV ¼ Accepts
� �:
The pooling equilibrium when the ONIAM is not pres-
ent is described by the following strategies:
sM NNð Þ; sM Nð Þ; sV� �
WithoutONIAM
¼ sM NNð Þ ¼ Proposal; sM Nð Þ ¼ Proposal;
sV ¼ Accepts
� �
if Dþ CV [ D apN þ ð1� aÞpN
� �.
For the third situation, the pooling equilibrium when the
ONIAM is not present is written as:
sM NNð Þ; sM Nð Þ; sV� �
WithoutONIAM
¼ sM NNð Þ ¼ No Proposal; sM Nð Þ ¼ No Proposal;
sV ¼ Accepts
� �
if Dþ CV [ D apN þ ð1� aÞpN
� �.
In the presence of the ONIAM, the separating equilib-
rium is:
sM NNð Þ; sM Nð Þ; sV� �
ONIAM
¼ sM NNð Þ ¼ No Proposal; sM Nð Þ ¼ Proposal;
sV ¼ Accepts
� �:
We observe that if D is relatively small (D [ (A0, A)),
the ONIAM encourages the physician to avoid the proposal
despite the policy implemented by the public authorities
(DI\DI). This policy turns out to be effective only if D is
A B Without ONIAM
With ONIAMD
PoolingProposal
Separating PoolingLack of Proposal
A’ B’
PoolingProposal
Separating PoolingLack of Proposal
D
37 Indeed, the lack of judicial error signifies that the responsible
physician has to be convicted (pN ¼ 1). In this context, the condition
B [ B0 is no longer satisfied.
L. Ancelot, C. Oros
123
relatively high (D 2 ðB; B0Þ), which signifies that the
ONIAM can encourage the settlements if the harm suffered
by the victim is important. This result thus raises the
question of whether the ONIAM is effective in all types of
medical accidents. Indeed, as the ONIAM is effective only
when D is important, we can consider that its effectiveness
will be all the higher as the damage suffered will be high
and thus D will be important.
Conclusion
The 2002 Kouchner law establishes the creation of the
ONIAM as a public authority enabled to compensate the
victims of medical accidents in two specific cases: if the
physician is not negligent and if the insurer does not make
any proposal for settlement negotiations. At the same time,
the ONIAM aims at encouraging the negotiations between
victims and insurers before the beginning of prosecution
requirements. Based on the observation that this law gen-
erates an increase of both the settlements and the com-
pensations, the issue of the effectiveness of this law is even
more relevant as it involves an important financial
responsibility from the state.
This article reconsidered the impact of the ONIAM on the
evolution of the settlement negotiations between the physician
and the victim. Using a dynamic game with incomplete
information, we developed a comparative analysis of the
Bayesian equilibriums identified according to two game con-
figurations supposing the presence or absence of the ONIAM.
We showed that the out-of-court settlement is highly
conditioned by the extent of the costs payable by the actors.
The presence of the ONIAM reinforces the effectiveness of
the settlement negotiations provided that the public
authorities can influence the costs incurred by the patients.
On the contrary, when the public authorities cover a part of
the compensations paid by the physicians, the presence of
the ONIAM becomes counterproductive.
Our study also showed that the ONIAM can be con-
sidered as an authority facilitating the out-of-court settle-
ments when the hypothesis of judicial error is relevant. The
ONIAM’s objective to develop the out-of-court settlements
can sometimes be achieved to the detriment of a potential
conviction of a non-negligent physician. If the judicial
system is reliable supposing a low probability for the
judicial errors, ONIAM encourages the out-of-court set-
tlements only for the medical accidents that are relatively
heavy implying important damage.
Our analysis can be further developed: a different
framework can be considered in which the physician plays
an active role in the definition of the compensation amount.
In this case, the physician will no longer use the referential
imposed by the ONIAM, but he/she could have more
leeway to define the amount proposed to the victim. This
situation was not examined here as we focussed mainly on
the role of the public authorities on the development of the
out-of-court settlements (a crucial role assigned to the
ONIAM). Nevertheless, relaxing this assumption could be
useful in order to better examine the impact on the physi-
cian’s incentives of revealing his/her private information.
The theoretical results of the article could be tested
empirically in order to identify the evolution of the percent
of the out-of-court settlements before and after the creation
of the ONIAM according to the nature of the medical
accidents generating a proposal from the physician or from
the ONIAM.
Acknowledgments The authors thank two anonymous referees as
well as David Crainich, Louis Eeckhoudt and the participants to the
34th JESF, 30th JMA and 2013 AFSE Meeting for their constructive
suggestions and comments.
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