I have heard time and again that increasing the length of prison sentences produces little or no improvements in crime rates. It is said that increasing the probability of arrest after a crime has much better results.

Is there evidence for this (especially in developing countries)?

  • I had trouble finding an example claim which didn't also provide evidence to support it.
    – Oddthinking
    Feb 8, 2014 at 9:41
  • Reduce crime rates inside or outside prison?
    – user1873
    Feb 10, 2014 at 6:25
  • rates outside prison.
    – josinalvo
    Feb 12, 2014 at 20:58
  • If someone is in prison, that person cannot commit a crime. Seems like it would have to help, unless it is like musical chairs (one criminal is caught, someone else steps in to their place).
    – user29285
    Oct 24, 2015 at 19:38


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