"We might think of dollars as being 'certificates of performance.' The better I serve my fellow man, and the higher the value he places on that service, the more certificates of performance he gives me. The more certificates I earn, the greater my claim on the goods my fellow man produces. That's the morality of the market. In order for one to have a claim on what his fellow man produces, he must first serve him."

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Thee might observe incidentally that if the state paid for child-bearing it might and ought to require a medical certificate that the parents were such as to give a reasonable result of a healthy child -- this would afford a very good inducement to some sort of care for the race, and gradually as public opinion became educated by the law, it might react on the law and make that more stringent, until one got to some state of things in which there would be a little genuine care for the race, instead of the present haphazard higgledy-piggledy ways.

— Bertrand Russell