What the free market determines is the least amount the employer can pay to get the most productivity. The difference between that and the value of the work done is the profit or loss. Employers want to maximize profits, therefore want to minimize the amount they pay. How little they can pay is not determined by the value added, but by the balance between the supply of people capable and willing to do the job, and the demand for those people. Which is why the Chamber of Commerce and their cronies want to flood the country with cheap labor.