6 books in series

Freakonomics

Freakonomics is a 6-book series with 6 released primary works first released in 2005 with contributions by Steven D. Levitt and Stephen J. Dubner.

Freakonomics: A Rogue Economist Explores the Hidden Side of Everything
SuperFreakonomics: Global Cooling, Patriotic Prostitutes, and Why Suicide Bombers Should Buy Life Insurance
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Piensa como un freak

When to Rob a Bank
Think Like a Freak
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Freakonomics + Superfreakonomics