If a firm is competing against a customer let's say for a non-prime loan perhaps that assumption is not quite so safe.

如果一家公司在和客户博弈,比如发放说次级贷款,可能假设不是那么完备

耶鲁公开课 - 博弈论课程节选

I'm going to claim that assuming that products are not identical, is a pretty safe assumption for most of the world, for most things that you're going to see in the world.

我认为假设产品不同,对大多数人来说很容易被接受,对多数情况来说

耶鲁公开课 - 博弈论课程节选