Perfect Competition, Features, Determination of Price under Perfect Competition

1. Introduction to Perfect Competition

Perfect competition is a market structure where a large number of buyers and sellers trade homogeneous products without any individual firm having control over the market price. Prices are determined by the forces of demand and supply, and firms act as price takers.

2. Features of Perfect Competition

Perfect competition is characterized by the following key features:

(i) Large Number of Buyers and Sellers

• No individual buyer or seller can influence the market price.
• The total market supply and demand determine the equilibrium price.

(ii) Homogeneous Product

• All firms sell identical goods with no product differentiation.
• Consumers have no preference for any particular seller.

(iii) Free Entry and Exit of Firms

• Firms can enter the industry if profits exist and exit if losses occur.
• This ensures no long-term supernormal profits or losses.

(iv) Perfect Information

• Buyers and sellers have complete knowledge about prices, costs, and products.
• No firm can charge a price higher than the market price.

(v) Price Takers

• Firms accept the price set by market demand and supply.
• No single firm can influence the price.

(vi) Perfect Mobility of Factors of Production

• Resources (labour, capital) can move freely across firms and industries.
• Ensures efficiency in resource allocation.

(vii) No Government Intervention

• No artificial restrictions like taxes, price controls, or subsidies exist.
• Prices are determined solely by market forces.

3. Price Determination under Perfect Competition

In perfect competition, price is determined by market forces of demand and supply. The equilibrium price is where market demand = market supply.

Steps in Price Determination

1. Market Demand and Market Supply Interaction
   • Demand Curve (DD): Downward sloping, showing that at lower prices, demand increases.
   • Supply Curve (SS): Upward sloping, indicating that higher prices encourage more production.
2. Equilibrium Price
   • The intersection of the demand (D) and supply (S) curves determines the equilibrium price (P*).
   • At this price, firms sell as much as they want, and consumers buy as much as they need.
3. Firm’s Equilibrium Output
   • Since firms are price takers, each firm sets output where Marginal Cost (MC) = Market Price (P*) to maximize profits.

4. Graphical Representation of Price Determination

Price Determination in Perfect Competition

Explanation of the Graph

The graph illustrates how price is determined under perfect competition based on market demand and supply.

1. Market Demand Curve (D – Blue Line)
   • Downward sloping, meaning as price decreases, quantity demanded increases.
2. Market Supply Curve (S – Red Line)
   • Upward sloping, meaning as price increases, firms supply more.
3. Equilibrium Price (P*)
   • The point where demand = supply (intersection of D and S curves).
   • Firms accept this price as they cannot influence the market.
4. Equilibrium Quantity (Q*)
   • The optimal quantity is where firms sell all their output without surplus or shortage.
5. Horizontal Lines
   • The dashed line at P* represents the equilibrium price accepted by all firms.
   • Any attempt to sell at a higher price leads to zero demand, as buyers can buy from other sellers at P*.

5. Conclusion

• In perfect competition, firms are price takers.
• Market forces (demand & supply) determine the price.
• Firms produce at MC = MR = P* to maximize profits.
• No long-run supernormal profits, as new firms enter when profits exist.