 Economic science begins with purposeful human action. And, as social scientists we can interpret human action in terms of beliefs, desires and intentions. “To employ a useful metaphor,” Hayek argued, “while in the world of nature we look from the outside, we look at society from the inside; while, as far as nature is concerned, our concepts are about the facts and have to be adapted to the facts, in the world of society at least some of the most familiar concepts are the stuff from which the world is made” (1948, 76).