"I believe that human preferences came to be what they are in those millions of years in which our ancestors (whether or not they can be classified as human) lived in hunting bands and were those preferences which, in such conditions, were conducive to survival. It may be, therefore, that ultimately the work of sociobiologists (and their critics) will enable us to construct a picture of human nature in such detail that we can derive the set of preferences with which economists start. And if this result is achieved, it will enable us to refine our analysis of consumer demand and of other kinds of behaviour in the economics sphere."