include all kinds: personal, family, economic, professional, legal, patriotic, international. At the center of each there is a pattern of stereotypes about psychology, sociology, and history. The same view of human nature, institutions or tradition rarely persists through all our codes. Compare, for example, the economic and the patriotic codes. There is a war supposed to affect all alike. Two men are partners in business. One enlists, the other takes a war contract. The soldier sacrifices everything, perhaps even his life. He is paid a dollar a day, and no one says, no one believes, that you could make a better soldier out of him by any form of economic incentive. That motive disappears out of his human nature. The contractor sacrifices very little, is paid a handsome profit over costs, and few say or believe that he would produce the munitions if there were no economic incentive. That may be unfair to him. The point is that the accepted patriotic code assumes one kind of human nature, the commercial code another. And the codes are probably founded on true expectations to this extent, that when a man adopts a certain code he tends to exhibit the kind of human nature which the code demands.
That is one reason why it is so dangerous to generalize about human nature. A loving father can be a sour boss, an earnest municipal reformer, and a rapacious jingo abroad. His family life, his business career, his politics, and his foreign policy rest on totally different versions of what others are like and of how he should act. These versions differ by codes in the same person, the codes differ somewhat among
