Duchamp invented the Readymade, but why is it called Art?

Question: Duchamp invented the Readymade, but why is it called Art!?
Best Answer - Chosen by Asker:

Duchamp did not 'invent' the readymade - it was already there!. What he did do was draw attention to it by showing it in a different format to a different audience in a different setting - then it was called 'art' by people who wanted to be known as art critics!. I'm sure you can work out the motivation!.Www@QuestionHome@Com

Because he says it is and it makes people think about Art and the many arguments about what Art is!.Www@QuestionHome@Com