ppt Market Evaluation and Policy: Coordination, Efficiency, and Failures

Coordination and Division of Labour

• Division of labour and specialisation are fundamental processes required to increase the production and consumption possibilities of an economy.

• While vital, these processes create coordination problems within society regarding the decisions of individual producers and consumers. Key questions include:

  • Who produces what, how they produce it, and in what quantities?

  • Who consumes what, and in what quantities?

• There are three primary organizational forms used to address these problems. No system exists in a pure form; every modern system contains elements of all three:

  • Traditional system.

  • Command system.

  • Market system.

Traditional Systems and Social Norms

• Historically, tradition dominated economic activities for centuries. It dictated production activities, performance methods, and the distribution of goods and services.

• Traditional systems offer little vocational choice. For example:

  • A son would automatically take over his father’s profession.

  • A wife would be in charge of the household.

• Social norms in these systems emerge as informal rules within small communities characterized by sufficient social control.

• These systems are feasible and useful when material conditions (available land, technology, and contact with other societies) remain static.

• Failure of traditional systems:

  • They fail quickly when changes occur, such as the emergence of new production technologies or the development of economic relations with new regions.

  • Historical example: During the Middle Ages, the reduction of transport costs and increased security led to a boom in trade throughout Europe. Trading activities concentrated in cities like Bruges and Antwerp, which established a status outside the traditional feudal system.

Command Systems

• In a command system, the central government makes the primary economic decisions:

  • What, how, and how much to produce.

  • Who receives and consumes specific goods and services.

• Adaptability: Central decision-makers have more adaptability compared to traditional systems.

• Critical Problems: These systems suffer from information, coordination, and incentive issues.

• Historical Example: Centrally planned economies in Central and Eastern Europe until 1989.

  • The "Great Leap Forward": An era of collectivization-industrialization.

  • Quantity stimuli led to the production of inferior goods, such as low-quality "pig iron."

  • Information quality was poor because of fear or the desire for status among reporters.

  • Consequences included severe food shortages and the deadliest famine in history.

Market Systems and Coordination

• A market system bases production and consumption on the decisions of individual companies and households.

  • Companies decide individually what, how much, and through what methods to produce.

  • Families decide individually what quantities of goods and services to purchase.

• Voluntary Exchange: The system coordinates through voluntary exchange. Exchange only occurs if both parties agree, implying a win-win scenario where both parties have an interest in the transaction.

• Resolution of Problems in a Market Context:

  • Incentive Problem: Resolved because both parties exchange out of self-interest.

  • Information Problem: Resolved because individuals know what is best for themselves and decide based on personal benefit.

  • Coordination Problem: Managed through a limited number of players in specific exchanges.

Market Systems with Many Agents

• When many agents are involved, no single agent has bargaining power; they are all "price takers."

• Individual Equilibrium:

  • Given a price, consumers decide based on their willingness to pay (demand).

  • Given a price, producers decide based on their cost (supply).

• Global Equilibrium: Free price formation leads to a global equilibrium where price remains at a "rest" state when demand equals supply ($D = S$).

The Signal Value of Prices

• Market forces (free price formation) coordinate decisions through prices.

• Signaling:

  • Producers look at production costs and only sell if compensated.

  • Consumers look at the benefit of consumption and only buy if the price is lower than their maximum willingness to pay ($WTP$).

• Dynamic Adjustment: Prices respond to changes in the socio-economic environment (e.g., changes in technology or preferences). Price changes create incentives that induce agents to adapt.

• Decentralization (The Invisible Hand):

  • No central authority is needed to collect info or guide agents.

  • This decentralized system is known as Adam Smith's ‘invisible hand.’

  • Signals are perfect in ‘ideal’ markets lacking market power, public goods, externalities, and asymmetric information.

Pareto Efficiency

• Assessment Criteria: Economists evaluate systems based on individual welfare.

• Pareto Improvement: A change that increases the welfare of at least one individual without decreasing the welfare of any other individual.

• Pareto Efficiency: A state where it is impossible to implement a Pareto improvement.

• Pareto Inefficiency: A state where resources are wasted because Pareto improvements are possible but not achieved.

The Pareto Frontier

• The Pareto Frontier shows the maximum welfare one individual (e.g., Lisa) can acquire when the welfare of all others (e.g., Bart) is fixed.

• The frontier is drawn based on:

  1. Given preferences of individuals.

  2. A given quantity of production factors.

  3. A given technology.

• Analysis of Points (using Lisa and Bart example):

  • Point A: Pareto efficient. One cannot increase Lisa's welfare without lowering Bart's.

  • Point D: Pareto inefficient. It is located inside the frontier.

  • Surface ADE: Represents the zone of all possible Pareto improvements from Point D. Points in this area improve at least one person's welfare without hurting the other.

Limitations of the Pareto Criterion

• It does not always allow for a preference of efficient points over non-efficient points (e.g., if one person gains while another loses).

• There are many Pareto efficient outcomes; the criterion cannot rank them against each other (e.g., A vs. C).

• The primary value of the criterion is the consensus that waste should be avoided.

Market Efficiency and Surplus

• First Fundamental Theorem of Welfare Economics: If price formation is left free in an ideal market, the equilibrium price leads to a Pareto efficient situation.

• An ideal market requires perfect competition (price taking) and the absence of market failures.

• At the market price, total surplus (total welfare) is maximized.

Consumer Surplus ($CS$)

• Definition: The difference between what a consumer is willing to pay ($WTP$) and what they actually pay ($P$).

  • $CS = \text{Willingness To Pay} - \text{Market Price}$

• Measurement: Measures the benefit consumers receive from market participation.

• Consumer Sovereignty: The principle that the consumer knows best what is good for them and acts rationally to estimate $WTP$.

• Exceptions (Bads): Consumers may not be rational (e.g., peer pressure, impulsive behavior, addiction). These items are termed "bads" instead of "goods."

Producer Surplus ($PS$)

• Definition: The difference between what a producer actually receives ($P$) and what they minimally wanted to receive, which is the marginal cost ($MC$).

  • $PS = \text{Market Price} - \text{Total Production Cost (TC)}$

• Measurement: Measures the benefit producers derive from participating in the market.

Calculating Total Welfare

• Total welfare is the sum of consumer and producer surplus.

  • $\text{Total Welfare} = CS + PS$

  • $\text{Total Welfare} = (WTP - (P \times Q)) + ((P \times Q) - TC)$

  • $\text{Total Welfare} = WTP - TC$

• In market equilibrium ($Q^*, P^*$), welfare is maximal.

• Deadweight Loss (Excess Burden): Any deviation from equilibrium results in welfare loss:

  • Underproduction: Marginal willingness to pay is greater than marginal cost.

  • Overproduction: Marginal cost is greater than marginal willingness to pay.

Social Efficiency vs. Market Efficiency

• Market efficiency does not automatically imply societal efficiency.

• Social Pareto Efficiency requires:

  • $\text{Marginal Social Benefit (MSB)} = \text{Marginal Social Cost (MSC)}$

• The price system connects individual benefits/costs to social benefits/costs.

Market Failures and Distribution

• Equity: Markets lack an automatic mechanism for fair wealth distribution. Efficient outcomes can coexist with poverty.

• Redistribution usually requires government intervention (e.g., taxes), which creates efficiency losses. Society must weigh equity against efficiency.

Types of Market Failure

• Imperfect Competition:

  • Monopoly (Supply side): Producer sets $P_j > MC_j$.

  • Monopsony (Demand side): Consumer negotiates $MWTP_{ij} > P_j$.

  • Note: Product differentiation found in imperfect competition is often valued by consumers.

• Public Goods:

  • Consumed by many simultaneously (e.g., national defense, street lighting).

  • $\text{Marginal Social Benefit (MSB)} > \text{Individual Willingness to Pay (WTP)}$.

  • Risk: Underproduction by the market.

• Externalities: Decisions impact agents not involved in the transaction.

  • Negative Production: $MC_j < MSC_j$ (Overproduction).

  • Negative Consumption: $MWTP_{ij} > MSB_{ij}$ (Overconsumption).

  • Positive Production: $MC_j > MSC_j$ (Underproduction).

  • Positive Consumption: $MWTP_{ij} < MSB_{ij}$ (Underconsumption).

• Internalities: Self-inflicted external effects across time (e.g., smoking).

• Asymmetric Information: One party has more info (e.g., used car sales).

  • Results in $MSB_{ij} \neq MWTP_{ij}$.

  • Can lead to the total disappearance of the market.

The Role of Government

• Governments intervene to correct market failures.

• Property Rights: For a market to function, government must define and respect property rights through a legal system.

• Correcting Signals: Governments should improve the price system (via taxes/subsidies) rather than replacing it.

• Government Failure: Politicians and civil servants follow self-interest. Issues include:

  • Bureaucracy/Inefficiency.

  • Lack of market discipline.

• Decision Steps for Intervention:

  1. Is there a market failure?

  2. Formulate ideal intervention and map consequences.

  3. Decide if intervention is actually desirable compared to the failure.

Questions & Discussion

• Multiple Choice Question 1: Given a market for an inferior good. After a decrease in income due to a crisis, in the new market equilibrium:

  • A) Total revenues will be lower.

  • B) Consumer surplus will be lower.

  • C) The marginal cost curve will be higher.

  • D) The producer surplus will be higher.

• Multiple Choice Question 2: Which statement is correct in a market equilibrium of a perfectly competitive market (no public goods, externalities, or asymmetric info) where supply is perfectly price elastic?

  • A) Consumer surplus = 0.

  • B) Producer surplus = 0.

  • C) Total surplus = Producer surplus.

  • D) There can be no welfare optimum.