If a firm in a competitive industry is making zero economic profit but still producing, it must be the case that:

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In a competitive industry, a firm making zero economic profit indicates that its total revenues are equal to its total costs, including opportunity costs. This situation is described by D) MC = MR = ATC, where marginal cost (MC) equals marginal revenue (MR) and average total cost (ATC), meaning the firm is covering all its costs, including the normal profit, but not making any economic profit.

If a Firm in a Competitive Industry Is Making Zero