Book excerpt: This book could be called "The Intelligent Person's Guide to Economics." The title expresses Duncan Foley's belief that economics at its most abstract and interesting level is a speculative philosophical discourse, not a deductive or inductive science. Adam's fallacy is the attempt to separate the economic sphere of life, in which the pursuit of self-interest is led by the invisible hand of the market to a socially beneficial outcome, from the rest of social life, in which the pursuit of self-interest is morally problematic and has to be weighed against other ends.