MICRO

Chapter One: Perfectly Competitive Market Structure

1. What is Market Structure?

  • Definition: Market structure refers to the nature and degree of competition that prevails within a particular market.

  • Types of Market Structure:

    • Perfectly Competitive Market Structure

  • Monopoly Market Structure

    • Monopolistic Competitive Market Structure

    • Oligopoly Market Structure

2. What Is a Perfectly Competitive Market?

  • Definition: A perfectly competitive market is one where there are many buyers and sellers, and all of them sell a homogeneous product. Price is determined by industry supply and demand, and no individual seller can influence the market price.

2.1 Assumptions/Features of Perfect Competition Market

  1. Large Number of Buyers and Sellers: Each seller and buyer is too small to influence the market price. Both are price takers.

  2. Identical Products: All firms sell an identical product, implying no product differentiation.

  3. Perfect Mobility of Factors of Production: Factors can move freely across firms without barriers.

  4. Free Entry and Exit: New firms can enter the industry without restriction, and existing firms can exit freely.

  5. Demand Characteristics: Individual firms face a perfectly elastic (horizontal) demand curve, while the industry's demand curve is downward sloping.

  6. Perfect Knowledge: Everyone has complete knowledge about the market conditions, prices, etc.

  7. No Government Interference: No taxes or subsidies from the government influence the market.

  8. Absence of Transport Costs: Transport costs are assumed to be negligible.

  9. Profit Maximization Goal: Firms strive to maximize profits.

3. The Firm’s Demand Curve Under Perfect Competition

  • In perfect competition, a firm faces a perfectly elastic demand curve at market price (P*). If a firm raises prices above P*, sales drop to zero as consumers can buy cheaper from competitors.

  • Average Revenue (AR) and Marginal Revenue (MR):

    • In this structure, AR, MR, and price (P) are equal.

4. Short-run Equilibrium of the Firm and Industry

4.1 Short-run Equilibrium of the Firm

  • The firm's objective is profit maximization, calculated as:

    • Total Revenue (TR): TR = Price (P) x Quantity Sold (Q)

    • Average Revenue (AR) = TR/Q = P

    • Marginal Revenue (MR) = dTR/dQ = P (since price is constant).

  • Profit (π) is given by the formula: π = TR - TC where TC = Total Cost.

4.2 Profit Maximization Criteria

  1. Total Revenue – Total Cost Approach:

    • Maximize profit when the difference between total revenue (TR) and total cost (TC) is greatest.

  2. Marginal Revenue = Marginal Cost (MR = MC):

    • A firm maximizes profit when MR equals MC, and MC must intersect MR from below (the second order condition).

5. Economic Profits and Normal Profits

  • Positive Profit: AC < P (Abnormal/Supernormal profit)

  • Zero Profit: AC = P (Normal Profit)

  • Loss: AC > P (Firm incurs loss)

  • If P < AVC, the firm shuts down to minimize losses (the shutdown point).

6. Supply Curve of the Firm and the Industry

  • The supply curve of the firm is its marginal cost curve above the shutdown point, while the industry supply curve is the horizontal sum of individual firms' supply curves.

7. Short-run Equilibrium of the Industry

  • The industry equilibrium price occurs where the industry's supply and demand equal.

  • In the short run, firms may be making supernormal profits or losses.

8. Long-run Equilibrium of the Firm and Industry

8.1 Long-Run Equilibrium of the Firm

  • In the long run, firms enter or exit the industry until profits are normal. Each firm produces at the minimum point of their long-run AC curve.

  • The long-run equilibrium occurs where: MR = LRMC = LAC.

8.2 Long-Run Equilibrium of the Industry

  • The entire industry's long-run equilibrium is achieved when all firms earn normal profits, and there is no incentive for them to enter or exit.

9. Summary of Key Concepts

  • Nature of Perfect Competition: Firms are price takers, with perfect knowledge and free mobility of resources.

  • Demand and Revenue: Each firm faces a perfectly elastic demand curve; AR = MR = P.

  • Firm Behavior: Focus on profit maximization, with equilibrium determined by where MC intersects MR.

  • Long-run Adjustments: Firms adjust input use to achieve normal profits, exiting or entering the industry as market conditions fluctuate.

Could you please provide more details about the business plan you would like to fill and edit? If there are specific sections or information you'd like to include or revise, let me know!