Which of the following is most likely to be an increasing-cost industry? A An industry whose firms experience diminishing marginal productivity. B An industry whose firms experience economies of scale. C An industry that is a major buyer in the markets for the inputs it uses D An industry that is a very small buyer in the markets for the inputs it uses. E An industry that is a major seller in the markets for its output. 答案是C，解答写递增成本产业指随产业规模扩大会使要素价格发生上涨的产业，而要 素价格的上涨系由於主要买者运作的结果(主要买者类似具有独买力量，随着要素雇用 数量的增加，其所订定的要素价格必随之上涨) 我自己觉得答案是D，如果今天是因产业扩大规模导致要素价格上升，那要素的主要 买者应该有跟要素供给者议价的能力呀，至少也比非主要买家上涨的幅度低吧？ 还是有别的解释呢？请教大家 --

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