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The Accident Externality from Driving

  • Edlin, Aaron S.
  • Karaca-Mandic, Pinar
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    We estimate auto accident externalities (more specifically insurance externalities) using panel data on state-average insurance premiums and loss costs. Externalities appear to be substantial in traffic-dense states: in California, for example, we find that the increase in traffic density from a typical additional driver increases total statewide insurance costs of other drivers by $1,725–$3,239 per year, depending on the model. High–traffic density states have large economically and statistically significant externalities in all specifications we check. In contrast, the accident externality per driver in low-traffic states appears quite small. On balance, accident externalities are so large that a correcting Pigouvian tax could raise $66 billion annually in California alone, more than all existing California state taxes during our study period, and over $220 billion per year nationally.

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    Paper provided by Berkeley Olin Program in Law & Economics in its series Berkeley Olin Program in Law & Economics, Working Paper Series with number qt6179d3nw.

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    Date of creation: 11 Jan 2007
    Date of revision:
    Handle: RePEc:cdl:oplwec:qt6179d3nw
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    1. Aaron S. Edlin, 1999. "Per-Mile Premiums for Auto Insurance," NBER Working Papers 6934, National Bureau of Economic Research, Inc.
    2. Steven D. Levitt & Jack Porter, 2001. "How Dangerous Are Drinking Drivers?," Journal of Political Economy, University of Chicago Press, vol. 109(6), pages 1198-1237, December.
    3. Jerry Green, 1976. "On the Optimal Structure of Liability Laws," Bell Journal of Economics, The RAND Corporation, vol. 7(2), pages 553-574, Autumn.
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