“But why not give each according to the value of his work?” you ask.

Because there is no way by which value can be measured. That is the difference between value and price. Value is what a thing is worth, while price is what it can be sold or bought for in the market. What a thing is worth no one really can tell. Political economists generally claim that the value of a commodity is the amount of labor required to produce it, of “socially necessary labor,” as Marx says. But evidently it is not a just standard of measurement. Suppose the carpenter worked three hours to make a kitchen chair, while the surgeon took only half an hour to perform an operation that saved your life. If the amount of labor used determines value, then the chair is worth more than your life. Obvious nonsense, of course. Even if you should count in the years of study and practice the surgeon needed to make him capable of performing the operation, how are you going to decide what “an hour of operating” is worth? The carpenter and mason also had to be trained before they could do their work properly, but you don’t figure in those years of apprenticeship when you contract for some work. Besides, there is also to be considered the particular ability and aptitude that every worker, writer, artist or physician must exercise in his labors. That is a purely individual, personal factor. How are you going to estimate its value?