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Profit attracts entry

Profit attracts entry

Profit attracts entry: this Effortless Math guide explains the topic in plain language, shows how it works through solved examples, and gives you free practice to try immediately, so the idea sticks instead of staying abstract. More firms increase market supply and lower price. Competitive firms are earning positive economic profit. In a constant-cost industry, […]

Use the market graph before the firm graph

Use the market graph before the firm graph

Use the market graph before the firm graph: this Effortless Math guide explains the topic in plain language, shows how it works through solved examples, and gives you free practice to try immediately, so the idea sticks instead of staying abstract. A price-taking firm cannot choose the price delivered by the market. A competitive firm’s […]

The short-run supply curve is marginal cost above AVC

The short-run supply curve is marginal cost above AVC

Profit depends on price relative to ATC

Profit depends on price relative to ATC

For a price taker, price equals marginal revenue

For a price taker, price equals marginal revenue

Classify evidence, not labels

Classify evidence, not labels

Entry determines whether profit persists

Entry determines whether profit persists

The firm’s demand reveals price-setting power

The firm’s demand reveals price-setting power

Separate the three decisions hidden in one firm question

Separate the three decisions hidden in one firm question

Shutdown is a short-run comparison with variable cost

Shutdown is a short-run comparison with variable cost

The marginal rule identifies the best output

The marginal rule identifies the best output

Economic cost includes implicit opportunity cost

Economic cost includes implicit opportunity cost