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The Deterrent Effects of Prison: Evidence from a Natural Experiment

Francesco Drago, Roberto Galbiati and Pietro Vertova ()
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Pietro Vertova: University of Bergamo

No 2912, IZA Discussion Papers from Institute of Labor Economics (IZA)

Abstract: In this paper we test for the theory of deterrence. We exploit the natural experiment provided by the Collective Clemency Bill passed by the Italian Parliament in July 2006. As a consequence of the provisions of the bill, expected punishment to former inmates recommitting a crime can be considered as good as randomly assigned. Based on a unique data set on post-release behaviour of former inmates, we find that an additional month in expected sentence reduces the propensity to recommit a crime by 1.24 percent: this corroborates the general deterrence hypothesis. However, this effect depends on the time previously served in prison: the behavioural response to an additional month of expected sentence decreases with the length of the prison spell. This second result can be hardly reconciled with the specific deterrence hypothesis according to which a stronger past experience of punishment should increase the sensitivity to future expected sanctions.

Keywords: recidivism; deterrence; crime; natural experiment (search for similar items in EconPapers)
JEL-codes: K42 (search for similar items in EconPapers)
Pages: 31 pages
Date: 2007-07
New Economics Papers: this item is included in nep-law
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Journal Article: The Deterrent Effects of Prison: Evidence from a Natural Experiment (2009) Downloads
Working Paper: The Deterrent Effects of Prison: Evidence from a Natural Experiment (2007) Downloads
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