Transcript Highlights Chapter 4 & 5
Highlights Chapter 4 & 5
Econ 4140 Greg Mason
Willingness to pay view of CBA Benefits = willingness to pay to gain wanted outcomes Costs = willingness to pay to avoid unwanted outcomes
Valuation in efficient markets – no effect on price.
•
Increase in supply has no effect on price.
•
Gross social benefits = net government revenue generated by the program + change in social surplus.
•
Supply shift to the right (publicly
•
provided good) increases benefits to consumers (S → S+q’).
−
The cost to the consumer of the new amount (q’) is offset by the benefits of consuming more
−
Only benefit is the increased revenue to supplier – government or (abq
1 q 0
) Supply shifts due to cost reduction which increases benefits to producers.
−
Benefit is the increase in producer surplus (abde)
Valuation in efficient markets – supply reduces price
• •
Downward sloping demand Increase in supply cases price to fall and change in social surplus is
abc.
Three scenarios a.
b.
c.
If goods are distributed free the increase in consumer surplus is
cbq 1 q 0
and the total is area abc
+ cbq 1 q 0
If good goes to consumers without charge, some receive the product who would not have purchased at P 1 .
Assume q due to increase in supply arises from cost reduction
−
increase in consumer surplus is P
0 P 1 ab
−
change in producer surplus
•
is P
0 ae-P 1
bd or ecbd-P
0 abP 1 Note that that the last scenario is the most realistic.
P 0
Valuation in inefficient markets – monopoly power reduces price
•
Monopoly – market demand is the
• • • • • • •
revenue schedule Marginal revenue is lower than the average revenue (MA
Profit maximization at MC=MR Consumer surplus – P
0 P m a
Producer surplus – P
m abx
The social surplus under monopoly is
P 0 abx
The social surplus under competition is
P 0 cX.
The deadweight loss is the reduction in social surplus due to monopoly.
X
Demand > 0, AC falling Natural Monopoly
• • • • •
Always defined by falling average cost over the region where demand exists for any price >0 Typical in capital intensive industries, or industries with high entry/exit barriers, and knowledge barriers Policies to deal with natural monopoly
−
Ignore and accept deadweight loss
−
Regulate (price so that price set at AC =
− −
AR) Regulate (price so that MC=AR) Allow free access (accept social cost that demand exceeds marginal cost) Natural monopolies usually erode due to technical change – high profits create incentives to innovate.
Policy may create temporary monopolies to induce innovation (e.g., pharmaceuticals).
Information asymmetry
• • • • •
Present in every market Imbalance between information held by sellers and buyers
−
Buyers can have the edge in labour markets (they know what the job truly entails)
−
Sellers (job applicants) can have the edge if they fabricate experience.
Where sellers have information, the presumption is that the demand would fall as addition product/service attributes become known to the buyer (D u → D i ).
The information asymmetry transfers P
acd.
u P i
ca to the seller from the buyer, and the deadweight loss is Policies
−
Caveat venditor and caveat emptor
−
Private market (Consumer Reports)
−
Public provision of information)
Externality Externalities create a divergence of
• • • • • •
marginal private and marginal social costs. Negative externality MSC > MPC Positive externality MSC < MPC Negative externality reduces consumer and producer surplus S # - S* = social costs = WTP to avoid the costs.
Market will under price good/service and too much is produced.
Taxation is the standard policy with the level set “t”, price shifts to P quantity drops to Q # .
# and Positive externalities work in reverse, subsidies to increase consumption.
Consumer Producer Third Parties Gov. Rev.
Social Benefit
Benefits
B + C + F A + E C
Costs
A + B E + F
Externality Make sure you can explain the mechanics of a positive externality
Public vs. private goods Private goods – demand sums horizontally MB is the marginal social benefit Consumer A demand falls to 0 Public goods – demand sums vertically
Opportunity cost – no price effect.
When a program has a negligible effect on the demand for an input, prices are not affected.
The amount paid for the inputs = social costs when input markets are competitive and the amount demanded is small in relation to the total market
.
Opportunity cost – in elastic supply.
When a program has a major effect on the demand for an input, prices are affected and prices face by others will be affected.
Major spending (stimulus package) can have regional impacts that are adverse. An opportunity cost exists Keynesian macro policy, when factor markets are not efficient.
Using national stimulus to increase demand to address unemployment in the southern Ontario market, can have an adverse impact on construction markets in Saskatchewan that are fully employed
.
Opportunity cost of inputs
• • • • •
All resources have opportunity costs.
Government (or anyone) entering the market will raise the demand for resources.
Price will rise as more is demanded.
The non-project demand and supply produces P 0 the inputs.
and q The project shifts the demand by q’ with the resultant 0 increase in resource cost of B+C+G+E+F for Increase in producer surplus Reduction consumer surplus for buyers General rule – opportunity cost of resources equals the expenditure on (-/+) any increase/decrease in social surplus in factor markets
Impact of a government project on labour
• • The equilibrium wage is P e , but a wage floor (P m ) reduces demand and increases supply (L d and L s ) • Unemployment is L s – L d • The project increases labour demand by L’ • At the price floor this reduces unemployment by L t -L • The shaded area measures the social cost of hiring s the unemployed workers which is less than the private cost (
abL t L e
).
The core idea is that in unemployed markets, the social cost of the resource is less than the private cost.
Opportunity cost in purchasing from a monopoly
• Monopoly will result in the cost of acquisition being above the social cost.
• At equilibrium (MR=MC) before the project, quantity purchased is Q1 at a price of P1.
• The project raises demand and price rises to P2 and quantity Q2. The rise in price reduces private demand and government purchases Q2-Q3.
• Total cost to government is A+C+G+E.
• The original buyers lose surplus = B+C • Monopolist gains B+C+G+E • Net social cost is A+C
General rule – since all factor markets have some degree of market power, large projects (public and private) impose costs on existing purchasers