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9.1
Pareto optimal general competitive equilibrium
is a special case of all the possible equilibria
There are others that are possible when market power and market failure exist
Figure 9.2.1 - Distribution of Society's Endowment and Distribution of Society's Product -With and Without Power Distorts
Social Endowment Social Product
A
B
Without Power Distortions
With Power Distortions
A
B
A
B
A
B
9.2.1
Exercising market power is not productive
It is exploiting an advantage that you have over the market
If you have it, it is wonderful
There are costs, though-Smaller piece for others
Makes the system less efficient
9.2.2
Monopoly – being the only seller in a market
Monopsony – being the only buyer in a market
Here, you are not a price taker
You can choose price/quantity combinations that are most advantageous
9.2.3
Naturally occurring market power does not come from distortions within the market process
They just happen
Ex. Supermodels, Michael Jordan
Egg donation – NY Times ad
9.2.4
The naturally occurring market power might have different effects in different markets
Ex. Basketball vs. Tiddlywinks
9.2.5
Why did Michael Jordan make so much?
Huge derived demand and limited possibilities for input substitution
Best possible case for a worker
Did he work hard?
Yes - making the most of his natural gift
9.2.6
If a firm produces huge amounts of a product,
it may begin to experience economies of scale-
because of the size of your operation, you can make things much cheaper per unit
A firm that experiences large economies of scale
call kill off all competition by virtue of this “head start”
It will be able to underprice any new entrant
Economies of scale can be a barrier to entry to a market
This can lead to a natural monopoly -
a single supplier with no competition
9.2.8 Artificially created market power
Patents – don’t occur in nature, come from governments
Firms sometimes buy up patents to protect their market power
9.2.9
Rent-maintenance – the exploitation of institutional power to sustain a market advantage
Ex. Donations to Congress or other rules-makers to prevent competition for your firm
9.2.10
Sometimes it’s not just about sustaining your advantage
Rent-seeking is when you try to create an advantage that isn’t there now
Lobbyists also do this
9.2.11
Smith pointed to rent-maintenance and rent-seeking
as threats to the market system in Great Britain
9.2.12
Artificial market power can be created through political institutions,
but social institutions can also factor into our perceptions of what is appropriate for
certain genders or races
9.2.13
Not only may social forces alter your own perceptions about what you may become,
they may also affect those who hire/admit you
This is a powerful, yet almost invisible, constraint that yields artificial market power for the privileged
9.2.14
Two jobs
MS = Men’s sphere
WS = Women’s sphere
Comparable jobs
Men’s sphere has higher pay to start
What happens with no market power?
Workers enter MS market, supply shifts out
As people leave WS, supply shifts back
Wage falls until all advantage is gone
Figure 9.2.3 - Market Pictures: Two Comparable Jobs, No Market Power - Adjustment
p
D
p1
p0
S1 S0
Q
p
D
p1
p0
Q
WS MS
S1S0
9.2.15
Relaxing the nice assumption of equal access to markets
If women are crowded into a certain set of jobs, excess supply – lower wages
AndThis also restricts supply in male set of jobs – so
higher wages result because of no female competition
9.2.16
Market power lessens efficiency
Firms don’t have to be totally efficient because perfect competition isn’t forcing them to do so
Pareto optimality is not reached
Equity – fairness – is another matter
Those with market power can alter the distribution of benefits to their advantage
Is that fair?
Maybe or maybe not, but it is a different yardstick
9.2.17
Apartheid in South Africa
Whites were a minority, but had a vast majority of the wealth
Limiting opportunities for Blacks preserved that power advantage
Education, or a lack thereof, had economic consequences
HS LS
Figure 9.2.4 - Market Pictures: High Skill vs. Low Skill Jobs without Market Power
p
Q
p
Q
p0
S
D
D
p0
S
Figure 9.2.5 - Market Pictures: High Skill vs. Low Skill Jobs with Market Power
p
Q
p
Q
p0
S
D
( S )
p '
p0
S
D
( S )
p '
DashedLines ReflectCase Without
Power
LSHS
9.2.19
Limits on education weren’t the only ones
Limits on mobility – passes
Limits on access to markets
All were “legal” – enforced by police and military
South Africa paid a price for this system
Loss of efficiency
Most of the population’s energy and creativity is blocked out
Pie could have been larger
Resources spent on rent-maintenance could have been better spent
9.2.21
The price of maintaining that advantage grew more and more expensive
Popular revolt – more jails and jailers
International sanctions hurt
Eventually Mandela goes from jail to President
Just changing laws is not the only change to make it a fair society
9.2.22 Conclusion on market power
It often existsIt reduces efficiency and changes the equity of the
market systemUnderstanding the effects of market power enriches
our analysis of the worldWe have a much more realistic model
9.3.1 Market Failure
We assume markets will form to quickly coordinate choices
If the market doesn’t form, or can’t coordinate well, we have a case of market failureThere are several types of market failure:
9.3.3
Public goods suffer from the free rider problemIf you believe you will get the benefit without
paying, you might not payEx. PBS - public television, National Public RadioIf everyone behaves as a free rider, the good might
disappear
9.3.4
Another type of market failure is an externalityThis occurs when property rights can not be assigned
or enforced
9.3.5
Air rightsAir can be used for breathing, or as a place to
dispose wasteEx. Smoking or pollutingA firm which pollutes has a consequence to others,
butits effect is external to its own assessment of the cost
of the activities
9.3.6 - 9.3.11
The problem becomes that there is no market for airthere is no price signalThere is no way to quantify the external effect on
others caused by their activity
These two examples are callednegative externalities because there is an external
cost to others
It is also possible to have a positive externality which adds an external benefit to others
Ex. Beekeeper -
pollinates local plants, too
Piano lesson -
music spills over to others
In the case of a negative externality,
the Marginal Social Cost = Marginal Private Cost + Marginal External Cost
MSC = MPC + MEC
or MEC = MSC - MPC
If there is no externality, MEC = 0 and
MPC=MSC
In the case of a positive externality,
the Marginal Social Benefit = Marginal Private Benefit + Marginal External Benefit
MSB = MPB + MEB
or MEB = MSB- MPB
If there is no externality, MEB = 0 and
MPB=MSB
Since society as a whole must consider
all costs and benefits when determining an optimum,
from a societal point of view, one should produce where
MSB=MSC
If no externalities exist,
then private optimization means social optimization
this is not always the case when you have market failure
With negative externalities,
firms tend to overproduce because
the market failure means the market does not allow
them to realize the extra “bad” that they do
With positive externalities,
firms tend to underproduce because
the market does not reflect the extra “goodness” they do
9.3.13
Risk externalities and technologyScientific experiments sometimes create unintended
consequences