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Measuring Positive Externalities from Unobservable Victim Precaution: An Empirical Analysis of Lojack

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  • Ian Ayres
  • Steven D. Levitt

Abstract

Lojack is a hidden radio-transmitter device used for retrieving stolen vehicles. Because there is no external indication that Lojack has been installed, it does not directly affect the likelihood that a protected car will be stolen. There may, however, be positive externalities due to general deterrence. We find that the availability of Lojack is associated with a sharp fall in auto theft. Rates of other crime do not change appreciably. At least historically, the marginal social benefit of an additional unit of Lojack has been fifteen times greater than the marginal social cost in high crime areas. Those who install Lojack, however, obtain less than 10 percent of the total social benefits, leading to underprovision by the market.

Suggested Citation

  • Ian Ayres & Steven D. Levitt, 1998. "Measuring Positive Externalities from Unobservable Victim Precaution: An Empirical Analysis of Lojack," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 113(1), pages 43-77.
    • Handle: RePEc:oup:qjecon:v:113:y:1998:i:1:p:43-77.
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    More about this item

    JEL classification:

    • H23 - Public Economics - - Taxation, Subsidies, and Revenue - - - Externalities; Redistributive Effects; Environmental Taxes and Subsidies
    • K42 - Law and Economics - - Legal Procedure, the Legal System, and Illegal Behavior - - - Illegal Behavior and the Enforcement of Law

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