Moderate

in long-run equilibrium in a competitive market, firms are operating at ?

Correct answer: B. all of these answers are correct

  • A. the minimum of their average-total-cost curves
  • B. all of these answers are correct
  • C. their efficient scale
  • D. zero economic profit
  • E. intersection of marginal cost and marginal revenue

Explanation

In long-run competitive equilibrium, entry and exit lead to zero economic profit, operation at the minimum of ATC, and production at the efficient scale; firms also choose output where MC equals MR. Thus all listed conditions are correct under the standard model.

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Individual consumers, firms and markets are examined through demand and supply, elasticity, consumer choice, production, costs, revenue and the determination of prices and output. The topic also covers market structures such as perfect competition, monopoly and oligopoly, plus market failure, externalities and the distinction between microeconomic decisions and economy-wide outcomes.

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