What Is the Endowment Effect?

The endowment effect says that we endow more value, we assign more value to something that we have. And so now i'm wondering, let's say you buy three xes, three dresses, t books, three whatever they are. One of them you got at a great bargain, one of them you paid kind of market price, and the other you hunted it down and paid above market price. I am curious to know what that endowment effect does to your feeling about those three objects in the long run.