from Part III - Other Areas of Policy
Published online by Cambridge University Press: 21 October 2026
Studies of the effects of the police on crime suggest that a 1 per cent increase in local police numbers will reduce local crime by 0.5 per cent. As for the effect of crime on the wellbeing of residents, a leading British study estimated that a 0.5 per cent fall in crime would increase average life satisfaction by 0.0011 points (out of 10). In this chapter we combine these findings, calculating the BCR for one more police officer, using the Treasury approach, which values one extra point of wellbeing for one year at £15,258. The result is a healthy BCR of 12:1.
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