This document discusses the concept of perfect competition in economics. It defines perfect competition as a market with many small firms, identical products, free entry and exit of firms, and complete information. The document outlines the key features of perfect competition including: a large number of buyers and sellers, homogeneous products, no barriers to entry or exit, and profit maximization by firms. It also discusses the short run and long run equilibrium of a perfectly competitive firm, including cases where firms experience super normal profits, normal profits, or losses.

1. Price and Output Determination
Under Perfect Competition
BSC AGRI 2
PAE
UNIT 3

2. • The concept of perfect competition was first introduced by Adam
Smith in his book "Wealth of Nations". Later on, it was improved by
Edgeworth. However, it received its complete formation in Frank
Kight's book "Risk, Uncertainty and Profit" (1921). Leftwitch has
defined market competition in the following words:
• "Prefect competition is a market in which there are many firms
selling identical products with no firm large enough, relative to
the entire market, to be able to influence market price".
• According to Bllas:
• "The perfect competition is characterized by the presence of many
firms. They sell identically the same product. The seller is a price
taker".
•

3. Features or Conditions for Perfect
Competition:
•
• (1) Large number of firms. The basic condition of perfect competition is that there
are large number of firms in an industry. Each firm in the industry is so small and
its output so negligible that it exercises little influence over price of the commodity
in the market. A single firm cannot influence the price of the product either by
reducing or increasing its output. An individual firm takes the market price as given
and adjusts its output accordingly. In a competitive market, supply and demand
determine market price. The firm is price taker and output adjuster.
•
• (2) Large number of buyers. In a perfect competitive market, there are very large
number of buyers of the product. If any consumer purchases more or purchases
less, he is not in a position to affect the market price of the commodity. His
purchase in the total output is just like a drop in the ocean. He, therefore, too like
the firm, is a price taker.
•

4. • The product is homogeneous. Another provision of perfect competition is that the good produced
by all the firms in the industry is identical. In other words, the cross elasticity between the products
of the firm is infinite.
• No barriers to entry. The firms in a competitive market have complete freedom of entering into the
market or leaving the industry as and when they desire. There are no legal, social or technological!
barriers for the new firms (or new capital) to enter or leave the industry. Any new firm is free to
start production if it so desires and stop production and leave the industry if it so wishes. The
industry, thus, is characterized by freedom of entry and exit of firms.
• (5) Complete information. Another condition for perfect competition is that the consumers and
producers possess perfect information about the prevailing price of the product in the market. The
consumers know the ruling price, the producers know costs, the workers know about wage rates
and so on. In brief, the consumers, the resource owners have perfect knowledge about the current
price of the product in the market. A firm, therefore, cannot charge higher price than that ruling in
the market. If it does so, its goods will remain unsold as buyers will shift to some other seller.
• (6) Profit maximization. For perfect competition to exist, the sole objective of the firm must be to
get maximum profit.

5. Distinction Between Pure Competition and Perfect
Competitions:
•
• For a pure competition to exist, there are
three main requisites, i.e., (1) homogeneity of
product (2) large number of firms and (3) ease
of entry and exist of firms. A perfect
competition, on the other hand, is made up of
all the six postulates stated earlier.

6. Definition and Explanation of
Equilibrium of the Firm:
•
MR = MC (Marginal Revenue = Marginal Cost)
Rule:

8. Short Run Equilibrium of the Price Taker Firm:
Three cases
Super Normal Profits
Normal Profits
Losses

9. Super Normal Profits

10. Normal Profits

11. Losses

12. Long run equilibrium

13. Source
• 1. Elementary economic theory - K.K. Dewett
and J.D. Verma
• 2. International Economics - B. Mishra
• 3. Fundamentals of Agricultural Economics -
A.N. Sadhu and A. Singh
• 4. Economics - Paul A. Samelson and W.D.
Nordhans (Pearson Publications)