Perfect competition (4)

Overview of Perfect Competition

• Many firms sell identical products with no entry restrictions and no advantages for established firms.

• All parties have complete information regarding prices.

Key Objectives

• Define perfect competition.

• Explain output decisions, shutdowns, layoffs, price and output determination, firm entry and exit consequences, demand changes, and efficiency promotion.

Characteristics

• Price Takers: Firms accept market prices.

• Product Homogeneity: Goods are perfect substitutes; individual firm demand is elastic.

Development

• Arises when minimum efficient scale is small relative to market demand, resulting in indistinguishable goods and no brand preference.

Economic Profit and Revenue

• Economic profit = Total Revenue - Total Costs.

• Total Revenue = Price × Quantity.

• Marginal Revenue = Change in Total Revenue from an additional unit.

Output Decision

• Profit Maximization: Firms maximize profit where MR = MC.

• Temporary Shutdown: Decisions consider losses and fixed costs.

Short-Run Equilibrium Conditions

• Firms may reach economic profit, break-even, or losses, influencing market entry and exit.

Demand Shifts Impact

• Increased demand raises prices and output; decreased demand lowers both.

Long-Run Adjustments

• Profitable firms attract new entrants, increasing supply and reducing prices; unprofitable firms exit, reducing supply and raising prices.

Technological Advances

• Technology reduces costs, shifts supply and market dynamics.

Efficiency in Perfect Competition

• Achieved when marginal social benefit equals marginal social cost, maximizing total surplus and producing at the lowest long-term average cost.