Long Run

Overview of Perfect Competition

• Definition of Perfect Competition

  • Numerous consumers and producers.

  • None possess market power to influence market price.

  • Firms sell identical products.

  • In the long run, all inputs are variable.

Characteristics of a Perfectly Competitive Firm

1. Many Consumers and Producers

   • No single entity can set the market price.

2. Identical Products

   • All firms offer products that are indistinguishable from one another.

3. Freedom of Entry and Exit

   • Minimal barriers to entering or exiting the market.

Importance of Market Price and Profitability

• Firms can determine their profitability based on market prices relative to average total costs.

  • Types of Profit Outcomes:

  • Profit: When market price is above average total cost.

  • Loss: When market price is below average total cost.

  • Break-even: When market price equals average total cost.

Market Dynamics and Incentives

• Profit serves as a significant incentive for new firms to enter the market.

  • Example: Observing neighbors profiting from tomato gardening may motivate others to start similar ventures.

• The expectation of profit leads to:

  • Increased number of firms entering the industry.

  • Until profits stabilize at zero economic profit due to increased entry and competition.

Long Run Adjustments in Perfect Competition

• If firms are making losses:

  • They exit the market, reducing supply.

  • Leads to price increases until remaining firms break even.

• Equilibrium in Long Run:

  • In the long run, all firms achieve zero economic profit.

  • Market supply matches market demand; adjusted production levels.

Calculation Example

• Given conditions for a market:

  • Total production capacity: 1,000 units.

  • Individual production per firm: 4 units.

  • Number of firms in the industry: 250.

  • Calculation: $(1000 \div 4 = 250)$.

Demand Changes and Market Response

• Health benefits of tomatoes lead to increased demand:

  • Short-run supply curves will shift appropriately.

• Long-run supply curve is more elastic:

  • More responsive adjustments as time elapses.

Elasticity of Supply

• Elasticity defined as the measure of responsiveness:

  • Influenced significantly by time; longer time frames allow for greater responsiveness in supply.

Summary of Perfect Competition Outcomes

• In a perfectly competitive industry:

  • Long-run equilibrium results in zero economic profits for firms.

  • Productive efficiency achieved when firms produce at minimum average total cost.

  • Goods distributed efficiently to those who value them most, based on marginal cost and marginal benefits.

Conclusion

• Recap of concepts discussed:

  • Dynamics of entry and exit in perfect competition.

  • Role of elasticity in market adjustments.

  • Emphasis on efficiency and optimization in production.

Final Remarks

• Encouragement to raise questions regarding the session's material.