[jdksmdbtbdnmsm]

> and makes it a function of labor quantity

Actually he makes it a function of socially necessary labor time. Although I don't buy into labor theory of value, I think the "socially necessary" part is a pretty important part.

By the way, what is "his argument?"

Parent didn't say it isn't central to one of Karl Marx's many arguments, but rather that it's not central to Marxism, which is far greater than Karl Marx. Marxism is an intellectual tradition largely concerned with critiquing Marx's work just like we're doing here.