Why were CEOs of large tobacco companies willing to testify under oath that nicotine is not addictive? Why might a patient with a sore knee be more likely to receive an MRI exam if he has conventional health insurance than if he belongs to an HMO? Why do physicians tend to overprescribe antibiotics? Through questions, The Economic Naturalist: In Search of Explanations for Everyday Enigmas makes fundamental economic principles understandable and relevant. See the rest of our review and others at the CT Health Policy Project’s Book Club.