Capitalism is a system of voluntary social cooperation in
which each benefits himself to the extent that he benefits others. He benefits
himself by earning money which he receives from others who value his goods or
services more than the money they spend in buying them.
Under capitalism, these others, in turn, have obtained their
money by benefitting more than equivalently those who have paid them, and so on
back to the first day of the chain of voluntary exchanges.
Capitalism actually gives the benefit of one’s work to others that altruism claims to seek, but propelled by the force of one’s self-interest rather than painfully extracted by self-sacrifice and physical force.
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