Chapter 9 - Competitive Markets

Competitive Markets Chapter Summary

Learning Objectives

  • Understand the market characteristics of perfect competition.

  • Explain how prices are established in competitive markets.

  • Identify why long-run economic profits approach zero in competitive markets.

  • Analyze how society benefits from market competition.

Chapter Goals

  • Explore the determination of prices in competitive markets.

  • Investigate the impact of competition on firm or industry profits.

  • Assess the benefits that society gains from market competition.

Market Supply Curve

  • Definition of Market Supply:

    • Market supply is the total quantity of a good that sellers are willing and able to sell at alternative prices in a given time period, ceteris paribus (assuming all other factors remain constant).

  • Composition of the Market Supply Curve:

    • The market supply curve is derived by summing the marginal cost (MC) curves of all firms within the market.

  • Factors Determining Market Supply in Competitive Industries:

    • The price of factor inputs.

    • Technology available for production.

    • Expectations about future market conditions.

    • Taxes and subsidies influencing production costs.

    • The number of firms currently operating in the industry.

The Short-Run Supply Curve

  • A competitive firm’s short-run supply curve includes:

    • The portion of the marginal cost curve that lies above the average variable cost (AVC).

  • Example:

    • At a market price of $3, the total quantity supplied is 150 pounds per day by all firms combined (denoted by regions a, b, and c).

Entry and Exit in Competitive Markets

  • Dynamics of Entry:

    • If more firms enter an industry, the market supply curve will shift rightward, leading to a decrease in market prices.

    • If prices fall too low, they may result in negative profits (losses) for the firms.

  • Impact of Low Prices:

    • If the market price falls below a firm’s minimum average total cost, some firms will exit the market.

    • The exit of firms will shift the market supply curve back to the left, assisting in stabilizing prices.

Tendency Toward Zero Profits

  • Continuous Entry:

    • The influx of new firms into a competitive industry leads to the gradual disappearance of economic profits.

  • Market Stabilization:

    • Once economic profit is eradicated, the entries and exits will stabilize, leading to no further economic profits.

  • Characteristics:

    • Economic profits remain transient in competitive markets due to the ease of entry and exit.

Barriers to Entry

  • Definition:

    • Barriers to entry are obstacles that prevent potential producers from entering a market—examples include patents and high startup costs.

  • Implications:

    • In the absence of significant barriers, new producers can enter a profitable industry, thereby driving down prices and profits.

Market Characteristics of Perfect Competition

  • Key Features:

    • Many Firms: A large number of firms operate within the market.

    • Identical Products: All firms provide homogeneous products that consumers perceive as identical.

    • Perfect Information: Consumers and producers possess all relevant information about prices and products.

    • Marginal Cost Equals Price: Firms maximize profit where marginal cost equals price (MC = P).

    • Low Barriers to Entry: Minimal obstacles for new firms entering the industry.

    • Zero Economic Profit: In the long run, firms earn normal profit with zero economic profit over time.

Real-World Example: Microcomputer Industry

  • Transition of the Microcomputer Market:

    • The microcomputer industry evolved and exhibited characteristics of competition, albeit not perfectly competitive.

    • Initially dominated by few successful companies (e.g., Apple), the industry saw entry by more than 250 firms from 1976 to 1983.

    • Increased competition led to downward pressure on prices and improved product quality, causing many firms to go bankrupt.

    • The competitive nature adjusted market prices significantly while improving consumer options.

Profit-Maximizing Output and Market Dynamics

  • Each competitive firm seeks output levels where marginal cost equals price for profit maximization.

  • The entry of new firms shifts the market supply curve to the right, paralleling the economic profits available until long-run equilibrium leads to zero economic profit.

  • Example Table 9.1 shows revenues, costs, and profits breakdown at various levels of output, helping to illustrate this concept.

Long-Run Rules for Entry and Exit

Price Level Implications for Firms:

  • p > ATC (Average Total Cost):

    • Firms gain profits, resulting in entry into the industry or capacity expansion.

  • p < ATC:

    • Firms incur losses, prompting exits from the industry or capacity reductions.

  • p = ATC:

    • Firms break even and maintain current capacity without further entry or exit.

Cost Management and Competitive Pressure

  • If a firm's average total cost curve shifts downwards, it can output more at lower costs, stimulating further production.

  • Market dynamics may lead to firms shutting down if market prices consistently fall below AVC, driving some firms to liquidate inventory, further depressing prices.

Allocative Efficiency and Market Mechanism

  • Allocative Efficiency:

    • Occurs when resources are distributed to produce the goods most desired by consumers.

    • Prices indicate the mix of goods through consumer demand signaling.

  • Production Efficiency:

    • Competition drives production to the lowest average total cost over time—maximizing economic efficiency.

Innovation and Consumer Impact

  • The pressures of competition stimulate continual improvements in products and technological processes, contributing to reduced prices and enhanced quality.

  • The ongoing cycle of profits attracting entrants and driving down costs may lead to rapid innovation and shifts in market offerings.

Conclusion

  • Competitive markets are characterized by continuous adjustment as firms respond to economic signals, striving to meet consumer desires while managing costs effectively. The dynamic nature of entry and exit along with market equilibrium underpins the evolution of industries toward greater efficiency and consumer benefit.