为什么当需求为单位弹性时，公司在价格(或数量)处收益最大化呢

问题如下：

For a particular product produced by a firm, the quantity at which demand is unit elastic is most likely the quantity that maximizes:

选项：

A.total profit from the product but not total revenue from the product. B.total revenue from the product but not total profit from the product. C.both total profit from the product and total revenue from the product.

解释：

A firm maximizes its revenue at the price (or quantity) where demand is unit elastic. This price or quantity is not the one that maximizes profit unless output can be increased at zero cost (no marginal costs).

中文解析：

当需求为单位弹性时，公司在价格(或数量)处收益最大化。除非产量能以零成本(无边际成本)增加，否则这个价格或数量不能使利润最大化。