When college students are tested for knowledge of basic economics six months after taking a traditional Economics 101 class, they fail to perform significantly better than students who have never taken an economics course, according to a survey in the American Economic Review (2002).

So why does Cornell professor of economics Robert Frank keep hearing from alumni who vividly recall his introductory economics course and still report using the economic principles he laid forth in his class?

Frank's latest book, 'The Economic Naturalist,' provides intriguing answers.

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