Gary Greenberg, psychologist and author of The Noble Lie and Manufacturing Depression, talks with EconTalk host Russ Roberts about the nature of addiction, depression and mental illness. Drawing on ideas in the two books, Greenberg argues that there are strong monetary incentives to define various problems as illnesses that psychiatrists "cure" with drugs. Greenberg argues that this distorts science and has strong impacts, good and bad, on how we view ourselves and the challenges of life. The conversation looks at the scientific basis for addiction and the role brain chemistry in depression. The conversation closes with a discussion of Greenberg's correspondence with the Unabomber.