Study Notes on Market Structures: Perfect Competition and Monopoly

Class Overview

  • Class Interaction

    • Mentioned silence in the room until 12:30 PM

    • Announcement of Test #2 to be held two weeks from the current date.

Review of Market Structures

Perfect Competition

  • Characteristics of Perfect Competition

    • Numerous sellers

    • Homogeneous products

    • No barriers to entry or exit

    • Firms are price takers

Price Determination

  • Firms in perfect competition must accept the market price

    • Example: If a wheat farmer refuses to sell at market price, they will not sell.

  • Illustrated with a graph showing five different pricing scenarios for competitive firms.

Demand Curve Dynamics

  • Effect of Demand Shift

    • Decrease in demand shifts the demand curve down, leading to a new market price.

Business Decision Making

Short Run vs. Long Run

  • Definitions

    • Short Run: One factor of production is variable, others are fixed.

    • Long Run: All factors of production are variable.

Profit Maximizing Rules

  • First Profit Maximizing Rule:

    • Condition: MR=MCMR = MC (Marginal Revenue equals Marginal Cost)

    • Firms must operate at the price taken from the market (market price).

  • Second Profit Maximizing Rule:

    • Condition: Operate where MR=MCMR = MC, if variable costs are covered in the short run and total costs in the long run.

Business Actions Depending on Market Conditions

  • Short Run Decisions based on Prices:

    • If Price decreases to P1:

    • Short Run: Firm cannot cover variable costs—needs to cease operations.

    • If Price increases to P2:

    • Short Run: Firm operates where MR=MCMR = MC.

      • If covering variable costs, will continue operation.

    • If Price is P3:

    • Operate where MR=MCMR = MC; covers variable costs and yields a profit.

    • Profit per unit represented graphically as the area of economic profit.

Introduction to Monopoly

Market Structure Spectrum

  • Discussed range from Perfect Competition (perfectly elastic demand) to Monopoly (perfectly inelastic demand).

Monopoly Demand Curve Characteristics

  • Demand curve for monopolies is relatively inelastic.

  • Example: Utilities demonstrating inelastic demand as customers will pay whatever price is set for necessities.

Comparison with Perfect Competition

  • In monopoly: Demand curve is downward sloping, whereas in perfectly competitive markets, it’s horizontal.

  • The marginal revenue curve in monopolistic markets differs significantly from the demand curve—a critical differentiation.

Explanation of Marginal Revenue vs. Demand Curve

  • Example with flip flops illustrates why marginal revenue does not equal the price point:

    • As price decreases to stimulate sales, marginal revenue decreases faster than price due to the spread across all units sold.

Formulae

  • Total Revenue Calculation:

    • Price per unit × Number of units sold.

Marginal Revenue Calculation

  • Defined as the change in total revenue as a result of selling one more unit of a good.

  • Illustrated with flip flop sales at decreasing price points and resulting marginal revenues:

    • Example values with specific prices and quantities sold as they dropped from $1.62 to $1.12.

Conclusion of Monopoly Discussion

  • Business operations within a monopoly follow the same rules as in perfect competition, but the price determination process differs.

  • Firms maximize profit at MR=MCMR = MC, then the price is found on the demand curve.

Long Run Outcomes for Monopolies

  • Analysis of economic profits: short-run profits can be considerable; long-run profits diminish towards normal profits due to potential market entry of competitors.

  • Legality of Monopolies

    • Discussed the significance of anti-trust laws such as the Sherman Antitrust Act.

Additional Notes

  • Future classes will cover implications of monopolistic behavior and regulatory measures.