资源简介

(共27张PPT)
EFFICIENCY, MARKETS, AND GOVERNMENTS
C h a p t e r 2
Positive Economics
Scientific approach to analysis that establishes cause-and-effect relationships among economic variables
Attempts to be objective
Formulates “If…then” hypotheses that can be checked against facts
Useful to the normative approach in that it cannot make recommendations to achieve certain outcomes without an underlying theory of human behavior
Normative Economics
Designed to formulate recommendations as to what should be accomplished
Not objective
Begins with predetermined criteria and is used to prescribe policies that best achieve those criteria
Useful to the positive approach in that it defines relevant issues
The Efficiency Criterion
Normative criterion for evaluating effects of resource use on individual well-being
Satisfied when resources are used in such a way as to make it impossible to increase the well-being of any one person without reducing the well-being of another
Often referred to as the criterion of Pareto optimality
Marginal Conditions for Efficiency
Total social benefit – any given quantity of an economic good available in a give time period will provide satisfaction to those who consume it
Marginal social benefit – the extra benefit by making one more unit of that good available in a given time period
Total social cost – the value of all resources necessary to make a given amount of the good available
Marginal social cost – minimum sum required to compensate the owners of inputs used for making an extra unit of the good available
Efficient Output
Efficient Output
Markets
In a perfectly competitive market:
All productive resources are privately owned.
All transactions take place in markets, in which competing sellers offer a standardized product to many buyers.
Economic power is dispersed in that no single buyer or seller can influence prices.
All relevant information is available to buyers and sellers.
Resources are mobile and may be freely employed in any enterprise.
Inefficiency in Competitive Markets
Prices do not always fully reflect marginal social benefits/costs of output
Means other than markets needed to make social benefits of certain goods available
Failure of markets to make available certain goods (national defense, environmental protection) gives rise to demand for government production and regulation
Loss of Efficiency Due to Monopolistic Power
Occurs when a firm influences the price of a product by reducing output to a level at which the price it sets exceeds marginal cost of production
Causes failure of markets to result in inefficient levels of output
Normative economists would prescribe government intervention to increase output in order to attain efficiency
Monopolistic Power
Loss of Efficiency Due to Taxes
Tax causes the amount of a good or service that is traded to be influenced by tax paid per unit, not only marginal social benefit/cost.
Therefore, the tax distorts decisions of market participants.
Taxes influence decisions to work by reducing the net gain from working.
Loss of Efficiency Due to Taxes
Loss of Efficiency Due to Government Subsidies
Basis for Government Intervention in Markets
Exercise of monopoly power in markets
Effects of market transactions on third parties
Lack of a market for a good with a marginal social benefit that exceeds its marginal social cost
Incomplete information
Economic stabilization
Equity Versus Efficiency
Many argue that resource allocation should also be evaluated in terms of equity, or perceived fairness of the outcome.
People differ in their ideas about fairness.
Analysts usually try to determine the effects of government actions on both resource allocation and the distribution of well-being.
The utility-possibility curve presents the maximum attainable level of well-being (utility) for one individual, given the utility level of others in the economy, their tastes, resource availability, and technology.
Utility-Possibility Curve
Equity Versus Efficiency in Competitive Markets
Critics of the market system argue that many participants cannot satisfy basic needs because they cannot pay for goods and services.
Critics of the market system argue that the poor should receive transfers financed by taxes on the more fortunate.
However, taxes used to alter the distribution of income distort incentives to produce, preventing achievement of efficiency.
Thus, equity versus efficiency causes conflict for policy makers.
Equity Versus Efficiency: Positive Analysis
Positive approach attempts to explain why efficient outcomes are, or are not, achieved
Can also predict how government intervention in private affairs affects likelihood of achieving efficiency
Attempts to predict whether changes in government policy will be agreed upon through political institutions, regardless of an efficient outcome
Improvements in efficiency are often opposed by special-interest groups that would suffer loses by the improvements
Appendix 2 – Welfare Economics
Welfare economics is the normative analysis of economic interaction that seeks to determine the conditions for efficient resource use.
Productive efficiency exists if it is not possible to reallocate inputs to alternative uses in such a manner as to increase the output of any one good without reducing the output of some alternative good.
Productive Efficiency
Use of the Edgeworth box to determine the condition that will lead to productive efficiency in the use of inputs.
The Production-Possibility Curve
Alternative way to summarize the economic information displayed in the efficiency locus:
Efficient Allocation
Pure Market Economy & Productive Efficiency
Efficiency criterion can be used to evaluate resource allocation in a pure market economy operating under conditions of perfect competition in all markets.
Price of any given commodity assumed to be identical for all buyers and sellers
Producers take the prices of labor and capital as fixed
Firms minimize the cost of producing any output:
C = PKK + PLL
Pure Market Economy & Productive Efficiency
Pure Market Economy & Pareto Efficiency
The tangency between two people’s budget constraint lines and an indifference curve in their indifference maps defines the market basket of goods they choose in order to maximize their utility.
Market Imperfections
Monopolists might influence the price of their output by manipulating their production.
Price is no longer a given.
To reach output level that maximizes profits, must restrict the amount of production per time period to a level below that which would prevail if the monopoly were a perfectly competitive industry
Monopolist produces less than what a perfectly competitive industry producing the same good would produce.
Therefore prevents the market from attaining an efficient resource allocation

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