Woah, I just read Value, Price, and Profit. I got this one.

In case anyone still gets caught up on the old argument made against the raising of wages or the one more commonly made argument against having a minimum wage: Marx demonstrated that the value of a commodity is determined by labor time, not wages. Instead of raising prices, increases in wages simply cut into the capitalist's profits. The money that is paid to the worker in the form of a wage and the profits claimed by the capitalist are both derived from the value created by the worker's labor. So, when one increases, the other must decrease proportionally.

Value, Price and Profit - Marx