Microeconomics Chapter 12: Economic Efficiency and Public Policy

Perfect Competition
- Many small firms
- Firms sell identical products
- All firms are price takers
- Free entry and exit
- Zero profits in long-run equilibrium
- Price = Marginal Cost (MC)
Oligopoly
- Few firms, usually large
- Strategic behavior among firms
- Firms often sell differentiated products and can set prices
- Significant entry barriers present
- Profits depend on firm rivalry and entry barriers
- Price > MC
- Output less than perfect competition but more than in monopoly
Monopolistic Competition
- Many small firms
- Firms sell differentiated products
- Each firm can set prices
- Free entry and exit
- Zero profits in long-run equilibrium
- Price > MC
- Firms have excess capacity (less output than in perfect competition)
Monopoly
- Single firm faces entire market demand
- Price setter
- Profits persist with sufficient entry barriers
- Price > MC
- Outputs less than perfect competition

Definition: Requires full employment of factors of production.
Full employment does not guarantee efficiency.
For a firm to be productively efficient, it must produce at the lowest possible cost.
For an industry to be productive efficient, marginal cost must be the same across firms.
Productively efficient firms contribute to the economy's position on the production possibilities boundary.

Definition: Occurs when the output level of each good sees its market price equal to its marginal cost.
Consumers maximize utility by adjusting consumption to ensure their marginal value matches the price.
Price reflects the marginal value to consumers, indicating efficiency in resource allocation.

Perfect Competition
- Long-run equilibrium results in firms producing at lowest point on Long-Run Average Cost (LRAC) curve.
- All firms equate marginal cost to market price, ensuring allocative efficiency across the economy.
Monopoly
- Monopolist maximizes profits through lowest-cost production methods, achieving productive efficiency.
- However, since price > MC, allocative efficiency is not achieved.
Monopolistic Competition and Oligopoly
- Both structures maximize profits and are productively efficient by using lowest-cost methods.
- It's unclear if the industry achieves productive efficiency due to product differentiation and lack of industry-wide price.
- Neither is allocatively efficient as price > MC.

Understanding concepts of consumer and producer surplus is crucial for analyzing market structures, particularly in perfect competition versus monopoly settings.

Market Failure: Occurs when markets fail to achieve efficient outcomes, often due to externalities impacting non-parties involved in transactions.

Government often responds to natural monopolies through:
1. Assuming ownership of the firm (crown corporations)
2. Regulating private ownership (pricing policies)
Common pricing policies for regulated monopolies include:
- Marginal-cost pricing
- Two-part tariffs
- Average-cost pricing

Marginal-Cost Pricing: Allocatively efficient (price = MC) but may incur economic losses if price < LRAC.
Average-Cost Pricing: Allocatively inefficient (price > MC) but allows firm to break even (price = LRAC).
Two-Part Tariff: Charges a fixed fee for access to a product and a variable fee for consumption.

Established in the late 1890s, made illegal practices such as:
1. Price-fixing agreements
2. Mergers harmful to public interest
3. Unfair trade practices

2009 amendments aimed to strengthen enforcement through
1. Increased penalties for marketing deception
2. Enhanced prosecution of cartels
3. Two-stage merger review process
4. Monetary penalties for market dominance abuses

Globalization challenges:
1. Market definitions shifting from national to international
2. Firms relocating to countries with lax competition policies, prompting a need for convergence in policies across nations.