Labor in a capitalist society earns a fraction of what it creates. Most products and services command their value-in-exchange. Hence a product utilizing twice as many resources will usually cost twice as much. However labor only commands its value-in-use. It is paid what is needed to reproduce itself, what Marx called the subsistence wage. The remainder, which is the bulk of the value created, is what Marx called Surplus Value, all of which flows to the owners of capital.
From a letter written by Abhay for the Four More Years of Economics correspondence project with Matthew Goulish. See www.year-of-economics.blogspot.com