Per-Mile Premiums for Auto Insurance
AbstractAmericans drive 2,360,000,000,000 miles each year, far outstripping other nations. Every time a driver takes to the road, and with each mile she drives, she exposes herself and others to the risk of accident. Insurance premiums are only weakly linked to mileage, however, and have largely lump-sum characteristics. The result is too much driving and too many accidents. This paper begins by developing a model of the relationship between driving and accidents that formalizes Vickrey's  central insights about the accident externalities of driving. We use this model to estimate the driving, accident, and congestion reductions that could be expected from switching to other insurance pricing systems. Under a competitive system of per-mile premiums, in which insurance companies quote risk-classified per-mile rates, we estimate that the reduction in insured accident costs net of lost driving benefits would be $9.8 -$12.7 billion nationally, or $58 -$75 per insured vehicle. When uninsured accident cost savings and congestion reductions are considered, the net benefits rise to $25 -$29 billion, exclusive of monitoring costs. The total benefits of uniform per-gallon insurance charge could be $1.3 -$2.3 billion less due to heterogeneity in fuel efficiency. The total benefits of optimal' per-mile premiums in which premiums are taxed to account for accident externalities would be $32 -$43 billion, or $187 - $254 per vehicle, exclusive of monitoring costs. One reason that insurance companies may have not switched to per-mile premiums on their own is that most of the benefits are external and the transaction costs to the company and its customers of checking odometers could exceed the $31 per vehicle of gains that a single company could temporarily realize on its existing base of customers.
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Bibliographic InfoPaper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 6934.
Date of creation: Feb 1999
Date of revision:
Publication status: published as Economics for an Imperfect World: Essays In Honor of Joseph Stiglitz. MIT Press, 2003.
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Postal: National Bureau of Economic Research, 1050 Massachusetts Avenue Cambridge, MA 02138, U.S.A.
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Other versions of this item:
- Aaron S. Edlin, 1999. "Per-Mile Premiums for Auto Insurance," Law and Economics 9902002, EconWPA.
- Aaron S. Edlin, 2003. "Per-Mile Premiums for Auto Insurance," Law and Economics 0303001, EconWPA.
- Aaron S. Edlin., 1999. "Per-Mile Premiums for Auto Insurance," Economics Working Papers 99-262, University of California at Berkeley.
- K13 - Law and Economics - - Basic Areas of Law - - - Tort Law and Product Liability; Forensic Economics
- H23 - Public Economics - - Taxation, Subsidies, and Revenue - - - Externalities; Redistributive Effects; Environmental Taxes and Subsidies
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Blog mentionsAs found by EconAcademics.org, the blog aggregator for Economics research:
- Are Economists Good at Business?
by Matthew E. Kahn in Environmental and Urban Economics on 2010-07-08 02:05:00
- Li, Shanjun, 2009.
"Traffic Safety and Vehicle Choice: Quantifying the Effects of the "Arms Race" on American Roads,"
dp-09-33, Resources For the Future.
- Shanjun Li, 2012. "Traffic safety and vehicle choice: quantifying the effects of the ‘arms race’ on American roads," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 27(1), pages 34-62, 01.
- repec:reg:wpaper:223 is not listed on IDEAS
- Edlin, Aaron S. & Karaca-Mandic, Pinar, 2005. "The Accident Externality from Driving," Department of Economics, Working Paper Series qt0hw1m6q2, Department of Economics, Institute for Business and Economic Research, UC Berkeley.
- Steimetz, Seiji S.C., 2008. "Defensive driving and the external costs of accidents and travel delays," Transportation Research Part B: Methodological, Elsevier, vol. 42(9), pages 703-724, November.
- Parry, Ian, 2005.
"Is Pay-As-You-Drive Insurance a Better Way to Reduce Gasoline than Gasoline Taxes?,"
dp-05-15, Resources For the Future.
- Ian W. H. Parry, 2005. "Is Pay-as-You-Drive Insurance a Better Way to Reduce Gasoline than Gasoline Taxes?," American Economic Review, American Economic Association, vol. 95(2), pages 288-293, May.
- repec:reg:wpaper:354 is not listed on IDEAS
- Parry, Ian, 2003.
"Comparing Alternative Policies to Reduce Traffic Accidents,"
dp-03-07, Resources For the Future.
- Parry, Ian W. H., 2004. "Comparing alternative policies to reduce traffic accidents," Journal of Urban Economics, Elsevier, vol. 56(2), pages 346-368, September.
- Elizabeth Kopits & Maureen Cropper, 2008.
"Why Have Traffic Fatalities Declined in Industrialised Countries?: Implications for Pedestrians and Vehicle Occupants,"
Journal of Transport Economics and Policy,
London School of Economics and University of Bath, vol. 42(1), pages 129-154, January.
- Kopits, Elizabeth & Cropper, Maureen, 2005. "Why have traffic fatalities declined in industrialized countries ? Implications for pedestrians and vehicle occupants," Policy Research Working Paper Series 3678, The World Bank.
- Delucchi, Mark A. & McCubbin, Donald R., 2010. "External Costs of Transport in the U.S," Institute of Transportation Studies, Working Paper Series qt13n8v8gq, Institute of Transportation Studies, UC Davis.
- Alma Cohen & Peter Siegelman, 2010.
"Testing for Adverse Selection in Insurance Markets,"
Journal of Risk & Insurance,
The American Risk and Insurance Association, vol. 77(1), pages 39-84.
- Alma Cohen & Peter Siegelman, 2009. "Testing for Adverse Selection in Insurance Markets," NBER Working Papers 15586, National Bureau of Economic Research, Inc.
- repec:reg:wpaper:412 is not listed on IDEAS
- Santos, Georgina & Behrendt, Hannah & Maconi, Laura & Shirvani, Tara & Teytelboym, Alexander, 2010. "Part I: Externalities and economic policies in road transport," Research in Transportation Economics, Elsevier, vol. 28(1), pages 2-45.
- Daniel P. Kessler & Daniel L. Rubinfeld, 2004. "Empirical Study of the Civil Justice System," NBER Working Papers 10825, National Bureau of Economic Research, Inc.
- repec:reg:wpaper:139 is not listed on IDEAS
- Laszlo Goerke, 2003. "Road Traffic and Efficient Fines," European Journal of Law and Economics, Springer, vol. 15(1), pages 65-84, January.
- Alma Cohen & Rajeev Dehejia, 2003.
"The Effect of Automobile Insurance and Accident Liability Laws in Traffic Fatalities,"
NBER Working Papers
9602, National Bureau of Economic Research, Inc.
- Cohen, Alma & Dehejia, Rajeev, 2004. "The Effect of Automobile Insurance and Accident Liability Laws on Traffic Fatalities," Journal of Law and Economics, University of Chicago Press, vol. 47(2), pages 357-93, October.
- Edlin, Aaron S. & Karaca-Mandic, Pinar, 2005. "The Accident Externality from Driving," Department of Economics, Working Paper Series qt2h23t6rt, Department of Economics, Institute for Business and Economic Research, UC Berkeley.
- repec:reg:wpaper:289 is not listed on IDEAS
- Edlin, Aaron S. & Karaca-Mandic, Pinar, 2007. "The Accident Externality from Driving," Berkeley Olin Program in Law & Economics, Working Paper Series qt6179d3nw, Berkeley Olin Program in Law & Economics.
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