완전경쟁(Perfect Competition)에서의 수익

Total revenue is the total income a firm receives from selling a given quantity of output. It is calculated by multiplying the product's selling price by the quantity sold. For example, if a wheat producer sells 100 bushels at $6 per bushel, total revenue equals $600. This represents all income generated before any costs are deducted.

Marginal revenue is the extra income generated by selling one additional unit. In a perfectly competitive market, marginal revenue always equals the market price because firms can sell as many units as desired at that fixed price. If the market price is $6 per bushel, selling one more bushel generates exactly $6 in marginal revenue.

Average revenue is the per-unit income calculated by dividing total revenue by quantity sold. In perfect competition, average revenue equals the market price because all units sell at the same price. If a farmer sells 200 pounds at $1 per pound for $200 total, average revenue is $200 divided by 200 pounds, which equals $1 per pound.

Firms are price-takers because they cannot influence the market price through their individual sales actions. In perfect competition, average revenue, marginal revenue, and market price are all equal, shown by a horizontal demand curve perfectly competitive market. Each firm must accept the prevailing market price and adjust quantity sold accordingly.

Total revenue increases as quantity sold increases, while average and marginal revenue remain constant in perfect competition. Both average revenue and marginal revenue equal the market price. This constant relationship reflects the horizontal demand curve and demonstrates that firms face uniform pricing regardless of output level.

When marginal revenue equals market price, each additional unit sold generates revenue equal to the market price. This occurs in perfect competition because prices are fixed and firms can sell unlimited quantities at that price. For a wheat producer selling at $6 per bushel, the 100th bushel and the 101st bushel each generate $6 in marginal revenue.

A firm calculates revenue per unit by dividing total revenue by the quantity sold, which is average revenue. In perfect competition, this always equals the market price. Whether a farmer sells 100 or 200 pounds at $1 per pound, the average revenue remains $1 per unit, matching the market price exactly.