Defining Capitalism

[Brad DeLong]

>Pardon my ignorance but selling a copy of microsoft windows does not
>exactly equal the import of a garment, even if their market price is
>equivalent.

Why not? Two centuries ago the physiocrats were busily saying that 
selling a garment did not exactly equal the import of foodstuffs, 
even if their market price is equivalent. They were wrong then. Do 
you have any reason to think that you are right now?