Why are people interested in money? Specifically, what could be the biological basis for the extraordinary incentive and reinforcing power of money, which seems to be unique to the human species? We identify two ways in which a commodity which is of no biological significance in itself can become a strong motivator. The first is if it is used as a tool, and by a metaphorical extension this is often applied to money: it is used instrumentally, in order to obtain biologically relevant incentives. Second, substances can be strong motivators because they imitate the action of natural incentives but do not produce the fitness gains for which those incentives are instinctively sought. The classic examples of this process are psychoactive drugs, but we argue that the drug concept can also be extended metaphorically to provide an account of money motivation. From a review of theoretical and empirical literature about money, we conclude that (i) there are a number of phenomena that cannot be accounted for by a pure Tool Theory of money motivation; (ii) supplementing Tool Theory with a Drug Theory enables the anomalous phenomena to be explained; and (iii) the human instincts that, according to a Drug Theory, money parasitizes include trading (derived from reciprocal altruism) and object play.Keywords: economic behaviour; evolutionary psychology; giving; incentive; money; motivation; play; reciprocal altruism
Why are people interested in money?This target article seeks to provide a biological explanation for one of the strongest motivations of humans living in modern societies: the desire to obtain money. We start by establishing some definitions. What do we mean by a "biological explanation"? What do we mean by money? And what do we mean by the motivation to obtain money?
Biological explanationBy the 1950s, the "grand theories of everything" that had emerged in early twentieth-century psychology seemed to have become extinct. But with the publication of Richard Dawkins ' (1976) book The Selfish Gene, the strongly Darwinian approach that has been called, with slightly varying nuances, sociobiology or evolutionary psychology emerged as a new and potentially universal way of addressing the Why questions about human behaviour. If people do something, the sociobiological argument runs, it must be because (a) doing it confers a selective advantage; or (b) although doing it does not now confer a selective advantage, it did at some period in our evolutionary past, most likely in the early history of Homo sapiens, within the Environment of Evolutionary Adaptation; or (c) the tendency to do it is a by-product of some other tendency, which does or did confer such an advantage.STEPHEN LEA is Professor of Psychology at the University of Exeter, U.K. He is the author of more than 150 publications spanning the areas of animal cognition, behavioural ecology, economic behaviour, and human visual perception. As well as being one of the founders of modern economic psychology in Europe, he is well known for his research on pattern...