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Research: media player

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Contributor(s): Mirko Draca

Released on 26 May 2009

What effect does raising the number of police have on crime? It might seem obvious that more police means fewer crimes - but things aren't that simple. For a start, there's the so called "endogeneity problem". Research economist Mirko Draca explains how the July 2005 terrorist attacks became a "natural experiment".

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