Question

How are prices determined under perfect competition?

Answer 1

Prices under perfect competition are determined by the interaction of overall market demand and supply at the industry level. No single firm can influence the price because:

• There are many firms, so the output of one firm is too small to affect total market supply.
• Products are homogeneous, so buyers will switch firms if a firm tries to charge a higher price.
• A firm’s demand curve is perfectly elastic at the market price, meaning the firm can sell any quantity at that price but cannot raise the price.

Equilibrium price is where market demand equals market supply. At this price, all buyers and sellers in the market agree. In the long run:

• If firms earn supernormal profits, new firms enter the market, increasing supply, which lowers the price until firms earn only normal profits.
• If firms incur losses, some exit, reducing supply and raising the price until normal profits are restored.

Thus, the market forces determine the price collectively, and individual firms accept that price and adjust output accordingly.