Richard D. Wolff

Hello Prof. Wolff, you have often referred to capitalism as exploitative to the workers, because the capitalists take the fruits of the workers labor through profit. What do you say to the neoclassical Marginal Revenue Productivity Theory of Wages, which states that wages are equal to a worker's marginal product? Labor is the source of value I suppose, but what about machinery? Doesn't it create value too? If it creates value, wouldn't the capitalist be able to profit off of their machine's value in the long term?