Microeconomics Final Exam Study Guide: Market Structures, Efficiency, and Government Policy

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Consumer, Producer, Social/Total Surpluses: Consumer Surplus is the difference between what consumers are willing to pay and what they actually pay. Producer Surplus is the difference between the price producers receive and the minimum they are willing to accept. Social/Total Surplus is the sum of consumer and producer surplus, representing total welfare in the market.
Demand = Marginal Benefit = Willingness to Pay: The demand curve reflects the marginal benefit to consumers, or their willingness to pay for each additional unit.
Supply = Marginal Cost: The supply curve represents the marginal cost to producers for each additional unit produced.
Economic Efficiency and Surplus Maximization: Efficiency is achieved when total surplus is maximized, typically at market equilibrium.
Price Ceiling and Price Floor Effects: Price ceilings (maximum legal price) and price floors (minimum legal price) can create shortages or surpluses, reducing efficiency.
Tax and Surplus Effects: Taxes create deadweight loss and reduce both consumer and producer surplus. Formula for Tax Incidence:

Compute consumer and producer surpluses from a graph.
Analyze the effects of price floors and ceilings on market outcomes.
Calculate deadweight loss due to government intervention (taxes, price controls).
Apply the concept of surplus maximization to evaluate market efficiency.

Conditions for Perfect Competition: Many buyers and sellers, identical products, free entry and exit.
Flat Individual Demand Curve: Firms are price takers; the demand curve for each firm is perfectly elastic at the market price.
Market Price = Marginal Revenue: In perfect competition, .
Profit Maximization Condition: Firms maximize profit where .
Short Run Shutdown Decision: Firms shut down if price falls below average variable cost ().
Long Run Market Adjustment: Entry and exit of firms drive profits to zero in the long run; market supply shifts accordingly.
Cost Curves:
- Total Profit:
- Operating Profit:
- Total Costs:
- Variable Costs:
- Fixed Costs:
Productive and Allocative Efficiency: Perfect competition achieves both when firms produce at minimum average cost and price equals marginal cost.

Conditions for Monopolistic Competition: Many firms, differentiated products, free entry and exit.
Downward Sloping Demand Curve: Firms have some control over price due to product differentiation.
Marginal Revenue (MR) and Marginal Cost (MC): Profit maximization occurs where .
Output and Price Effects:
- Output Effect: Selling more increases revenue.
- Price Effect: Selling more requires lowering price, reducing revenue per unit.
Efficiency: Monopolistic competition does not achieve productive or allocative efficiency; firms produce at higher average cost and price exceeds marginal cost.
Consumer Benefits: Product variety can increase consumer welfare.

Oligopoly: A market structure with a few large firms, interdependent decision-making, and barriers to entry.
Game Theory: Used to analyze strategic interactions among firms.
Prisoner's Dilemma: Illustrates why firms may not cooperate even when cooperation is mutually beneficial.
Punishment Devices: Price matching and other coordination mechanisms can help firms reach better outcomes.
Price Leadership: One firm sets price, others follow.
Antitrust Policy: Government regulation to prevent collusion and promote competition.

Monopoly: A market with a single seller of a good or service with no close substitutes.
Sources of Monopoly Power: Patents, copyrights, trademarks, public franchises, control of key resources, and network externalities.
Natural Monopoly: Occurs when a single firm can supply the market at lower cost than multiple firms due to economies of scale.
Pricing Behavior: Monopolists set price above marginal cost, leading to deadweight loss and reduced efficiency.
Government Regulation: May be necessary to limit monopoly power and protect consumers.