EC4004 Lecture 9 - Stephen...
Transcript of EC4004 Lecture 9 - Stephen...
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Market Failure
EC4004 Lecture 9
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Today.
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Online Exam.
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Price
Demand at each Price, D(p)
Qua
ntity
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d, Q
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uppl
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at e
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e Supply at each Price, S(p)
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086 067 6489
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Today
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Market Failure
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Definition. Where the market mechanism fails to allocate resources efficiently
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Efficiently?
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Social Efficiency external costs/benefits accounted for.Allocative Efficiency society produces goods/services at minimum cost to consumers.Technical Efficiency production of goods/ services using minimum resources.Productive Efficiency production of goods/services at lowest factor cost.
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We see market failure everywhere.
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1. Imperfect Information
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2. Market Power
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Market Power
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3. Inequalities
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The world is an unequal place.
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4. External Costs/Benefits
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Results of Market Failure: Inadequate provision of Merit
Goods
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Street Lighting.
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Defense.
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Medical Care.
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Public Goods.Excludability (Free-Rider)Rivalry (Societal Benefits)
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Public Goods provide 1. External Costs
and 2. External Benefits
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Market Failure
External CostsDecision makers don’t take into account the cost imposed on society and others as a result of their decision.
Examples: pollution, traffic congestion, environmental degradation, depletion of the ozone layer, misuse of alcohol, tobacco, anti-social behaviour, drug abuse, poor housing
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External Costs
Price
Quantity Bought and Sold
MSB
MPC
€5
100
MSC = MPC + External Cost
€12
Social CostValue of the negative externality (Welfare Loss)€7
80
Socially efficient output is whereMSC = MSB
The Marginal Social Benefit curve (MSB) represents the sum of the benefits to consumers in society as a whole – the private and social benefits. The Marginal Private Cost (MPC) curve represents the costs to suppliers of producing a given output.
The MPC does not take into account the cost to society of production. At an output level of 100, the private cost to the supplier is €5 per unit but the cost to society is higher than this (€12).
The true cost therefore is the MSC (the MPC plus the external cost). Current output levels therefore (100) represent some element of market failure – price does not accurately reflect the true cost of production.
The difference between the value of the MSB and the MSC represents the welfare loss to society of 100 units being produced.
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Market Failure
External benefits – by products of production and decision making that raise the welfare of a third party
Examples: education and training, public transport, health education and preventative medicine, refuse collection, investment in housing maintenance, law and order
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External BenefitsPrice
Quantity Bought and Sold
MPB
MSC
€5
100
Value of the positive externality (Welfare Loss)
Socially efficient output is whereMSC = MSB
MSB
€10
€6.50
140
Social Benefits
There can be a position where output is less than would be socially desirable. In this case, the sum of the benefits to society is greater than the private benefit to the individual.
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We can correct Market Failure via
State provisionExtension of property rightsTaxationSubsidiesRegulationProhibitionPositive discriminationRedistribution of income
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086 067 6489
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Lemons.
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Big idea: MSB = MSC
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Information Economics
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Idea: different amounts of information can lead to market failure.
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Core: Asymmetric Information
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Asymmetric Information: if one side of the market is better informed than the
other
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ExamplesThe market for used cars : Sellers know quality of the cars, but buyers might not
Labour market: Workers know their ability or reliability, but firms might not
Insurance markets: Drivers may know more about their driving habits than the insurance companies do
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Principle Agent Problem
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PA: One individual (the agent) takes an action that affects the well-being of another (the principal)
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2 Problems:
1. adverse selection (hidden information)
2. moral hazard (hidden action)
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Adverse selection arises when an individual’s decision to participate in the market conveys negative information
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Solutions?
Screening: when an uninformed party attempts to elicit information from an informed party
– e.g., offer a menu of insurance contracts
Signaling takes place when the informed party takes a costly action in an attempt to convey the information
– e.g., go to college
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Lemon Market(George Akerlof)
100 used cars are offered for sale.
• 50 cars are plums, 50 are lemons
• Buyers have identical preferences
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If we assume owners of good cars value them at v = €1,250
EV of buyers is thus greater than v and cars will be sold…
Equilibrium in good car market at F with 1,000 cars sold for €1,500
Equilibrium in lemon market at f with 1,000 lemons sold at €1,500
No efficiency problem but equity problem exists…
Sellers of lemons benefit while sellers of good cars suffer
Buyers of good cars benefit while buyers of lemons suffer
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Asymmetric Information
P P
Q Q
Market for Lemons Market for Good Cars
750
1,250
1,000 1,000
SL S1
1,5001,500D*D*
1,000DL
2,000DG
Ff
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If we now assume owners of good cars value them at v = €1,750
EV of buyers is thus less than v and no good cars will be sold…
No cars sold in good car market!
Buyers realise that at any price less than €1,750, they can only buy lemons
Thus equilibrium in lemon market is e with 1,000 cars sold for €1,000
Lemons drive good cars out of the market
Inefficient as good cars remain with owners who value them less than potential buyers
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Asymmetric Information
P P
Q Q
Market for Lemons Market for Good Cars
750
1,000 1,000
SL S2
1,750
1,5001,500D*D*
0
Zero good cars sold
1,000DL
e
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• Adverse selection problem has led to competitive market becoming inefficient and lowered overall welfare
• Lemons problem does not occur when information is symmetric
• i.e. when buyers and sellers have full information or when both have equal partial information
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A more general problem.
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Assume buyers & sellers are risk neutral
Buyers value lemons at €1,000
Buyers value good cars at €2,000
Reservation price for owners of lemons: €750
Reservation price for owners of good cars: €1,750
Share of owners who have lemons is θ
For what value of θ do all potential sellers sell their used cars?
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Solution: first find out how much buyers are willing to pay for all used cars
P = [€2,000 x (1 – θ)] + (€1,000 x θ)
P = €2,000 - €2,000θ + €1,000θ
P = €2,000 - €1,000θ
Second: solve for values of θ such that all cars are sold
All owners will sell if market price ≥ reservation price of €1,750
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We know P = €2,000 - €1,000θ
We know P must equal or exceed €1,750
€1,750 = €2,000 - €1,000θ
€250 = €1,000θ
θ = 250 ÷ 1,000 = ¼
For θ ≤ ¼ all the cars are sold
i.e. if a quarter or less of used cars are lemons all the used cars will be sold
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Main methods for solving adverse selection problems:
1. Restrict opportunistic behaviour
2. Compulsory car insurance
3. Mandatory health insurance in some companies
4. Product liability laws
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Summary:
When information asymmetry exists, bad products can drive out good. We can regulate against this.