Steve Keen's Debunking Economics has a good section on the problems with Marx's labor theory of value. IIRC, Marx's original sketch included a good model of the effects of capital, but he later neglected that to focus on labor alone and later Marxists kept that tradition.
Trying to figure how why asking for evidence for something is considered worthy of a downvote by the people on this orange site. Is it because it was too 'to the point' and not verbose enough?