He also says that it is common to exaggerate information in anything from house ads to resumes.

Why do Drug Dealers Still Live With Their Moms?

This chapter deals with conventional wisdom and when to question it, such as the idea that all drug dealers are wealthy, when if fact, many still live at home. The premise of this chapter is on how to find the right data to prove or disprove a theory, and how difficult that can be. To answer this question, Levitt found a researcher who had spent a long period of time with a black gang in Chicago, and learned how to ask the right questions to generate data about the gang. He finally showed that most gang drug dealing is only profitable for a very few upper echelon gang members, and most make little from their efforts.

Where Have all the Criminals Gone?

Levitt maintains...
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