Perfect Competition — Loss-Making Firm

What this diagram shows

This diagram shows a perfectly competitive firm making economic losses in the short run, where the market price falls below the firm's average total cost curve. The firm produces where marginal cost equals marginal revenue (the market price), but at this output level, average total cost exceeds price, creating a loss shown by the shaded rectangular area. Despite making losses, the rational firm continues operating because the price still covers average variable costs, meaning it can pay its variable costs and contribute something toward fixed costs. This situation demonstrates why firms might remain in markets temporarily even when unprofitable.

Key points

• The firm produces at the profit-maximising output where MC = MR = P, but makes losses because P < ATC at this quantity
• The loss per unit equals the vertical distance between price and ATC, with total losses shown as a rectangular area
• The firm continues operating in the short run because P > AVC - it covers variable costs and contributes to fixed costs
• If price fell below AVC, the firm would shut down immediately as it couldn't even cover its variable costs
• In the long run, if losses persist, firms will exit the industry, reducing supply and pushing prices back up toward break-even

Exam board notes

All major exam boards treat this diagram identically, focusing on the short-run versus long-run distinction and the shutdown condition. Some specifications emphasise the dynamic adjustment process more heavily, particularly how losses lead to eventual industry exit and market adjustment.