Here's Levitt's explanation: "Legalized abortion lowered unwantedness. Unwantedness is related to crime, so legalized abortion lowered crime."
Levitt summarizes his unorthodox research in a new book, "Freakonomics: A Rogue Economist Explores the Hidden Side of Everything." With co-author Stephen Dubner, he details some eyebrow-raising findings
Guns kill fewer kids than swimming pools.
Gang members may not be mama's boys, but they often share mama's house.
The Ku Klux Klan and real estate agents have something in common. (More on that later.)
Levitt took on another social issue when he teamed up with another researcher to develop a statistical method that found a small number of Chicago teachers cheated on standardized tests to help their students. Those findings led to disciplinary action.
http://www.cnn.com/2005/SHOWBIZ/book....ap/index.html
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Interesting stuff.