A)Both perfect competition and imperfect competition.
B)Perfect competition only.
C)Neither perfect competition nor imperfect competition.
本帖隐藏的内容
答案 BIn perfectly competitive markets, firms can sell the entire quantity they produce at the market price, so marginal revenue is equal to the market price. In imperfect competition, firms are price searchers in that they can increase their quantity sold only by decreasing the selling price per unit. As a result, marginal revenue is less than price.