Explain the implications of 'perfect competition' and its key characteristics, including firm behavior and profit conditions.

a) Briefly explain the implication of the underlined phrase?

The underlined phrase "Under perfect competition, each firm faces a perfectly elastic demand curve" implies that individual firms are price takers. They have no market power to influence the price and must accept the prevailing market price. If a firm tries to charge a price even slightly above the market price, it will lose all its customers to competitors selling identical products.

b) Give four features of a perfect market.

• There are a large number of buyers and sellers, none of whom can influence the market price.
• All firms produce homogeneous products, meaning the goods are identical and perfect substitutes.
• There is free entry and exit for firms into and out of the market.
• Both buyers and sellers have perfect information about prices, products, and market conditions.

c) What type of profit would an efficient firm operating in a perfect market earn in the:

i. Short run?
In the short run, an efficient firm in perfect competition can earn economic profits (supernormal profits), normal profits, or even economic losses.

ii. Long run?
In the long run, due to free entry and exit, an efficient firm in perfect competition will earn only normal profits (zero economic profit).

d) State the condition under which a firm in perfect competition:

i. Shuts down in the short run.
A firm shuts down in the short run if the market price falls below its average variable cost (P < AVC).

ii. Shuts down in the long run.
A firm shuts down (exits the market) in the long run if the market price falls below its average total cost (P < ATC).

iii. Attains equilibrium
A firm attains equilibrium (maximizes profit) when its marginal cost equals its marginal revenue (MC = MR). In perfect competition, this is equivalent to Price = Marginal Cost (P = MC).

e) State two forms of imperfect competition

• Monopoly
• Oligopoly