I suggested before that the whole of economic history could be rewritten in terms of this gradual suppression of the primitive instincts by what we very mistakenly call "artificial” rules. Of course, they are not in the strict sense artificial. Nobody ever invented them. They were not the result of design. The new manners of conduct were not adopted because anybody thought they were better. They were adopted because somebody who acted on them profited from it and his group gained from it, and so these rules, without anybody under standing them-that is very important for the later part of my argument-without anybody understanding in what way they benefited their community, gradually came to be generally accepted.