CFA level I 考试 Economics Reading13 的第二个问题，我不大懂，请各位指教。<br/><br/>题目是： For a particular product produced by a firm, the quantity at which demand is unitary elastic is most likely the quantity that maximizes <br/>A,  total profit from the product but not total revenue from the product<br/>B,  total revenue from the product but not total profit from the product<br/>C,  both total profit from the product and total revenue from the product<br/>D, neither total profit from the product nor total revenue from the product<br/><br/>书后答案是B，可我觉得是D, 因为是unit elastic product, total revenue不是应该不变的吗？这题目好像太简单了，不过我实在是不懂。。。<br/>