If each member of society can be induced or impelled to do his allotted task by associating it with some motive that appears to him adequate, then he need never know how he is contributing to the real end, and need not even be aware of the end at all. It is this problem of organization that we shall call the Economic Problem. It is in fact the real subject matter of political economy.

Chapter I, "The Problem Profounded", p. 3. - The Economic Problem (1925)