"Worth" by what measure? If the labor is treated as a commodity, it will lower the wages to the subsistance level (or below for some limited and turbulent time). This is how the invisible hand of the free market works - it makes people/commodities as cheap as possible.
By the same measure that everything else is (or should be) measured: individual performance.
If the labor is treated as a commodity,
That is the opposite of what I am saying. Labor should never be treated as a commodity as the Minimum wage laws dictate. But as a mutually beneficial contract between employees and employers. This, of course, will not happen because too many have the entitlement mentality.