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Why do the keypads on drive-up cash machines have Braille dots? Why are round-trip fares from Orlando to Kansas City higher than those from Kansas City to Orlando? For decades, Robert Frank has been asking his economics students to pose and answer questions like these as a way of learning how economic principles operate in the real world-which they do everywhere, all the time. Once you learn to think like an economist, all kinds of puzzling observations start to make sense. Drive-up ATM keypads have Braille dots because it’s cheaper to make the same machine for both drive-up and walk-up locations. Travelers from Kansas City to Orlando pay less because they are usually price-sensitive tourists with many choices of destination, whereas travelers originating from Orlando typically choose Kansas City for specific family or business reasons. The Economic Naturalist employs basic economic principles to answer scores of intriguing questions from everyday life, and, along the way, introduces key ideas such as the cost-benefit principle, the “no cash on the table” principle, and the law of one price. This is as delightful and painless a way to learn fundamental economics as there is.

罗伯特·弗兰克，博物经济学家，康奈尔大学约翰逊管理学院经济学和管理学教授，《纽约时报》经济专栏特约评论员。弗兰克不是一位学术型经济学家。他主张经济学应该是一门根植于经验和观察的社会科学，而不是以数学为核心的硬科学。