Americans 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 [1968] 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 a uniform per-gallon insurance charge could be $1.3 - $2.3 billion less due to heterogeneity in fuel efficiency. The total benefit 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 not have 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.
Download Info
To download:
If you experience problems downloading a file, check if you have the
proper application to
view it first. Information about this may be contained
in the File-Format links below. In case of further problems read
the IDEAS help
file. Note that these files are not on the IDEAS
site. Please be patient as the files may be large.
Publisher Info
Paper provided by University of California at Berkeley in its series Economics Working Papers with number
99-262.
Cited by: (explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)