What Is the Minimum Value of Labor?

The substance of the value of a thing is going to be the labor that went into it. But how do we actually determine the value of labor itself? How do we say that some one's time is worth x amount of dollars? Or x number of hours put into making a coat is going to earn,. however much, within the market place)? Well, we measure thevalue of labor based on the amount that is required to keep the laborer alive.