The Effect of Traffic Safety Laws and Obesity Rates on Living Organ Donations

This paper uses variation in traffic safety laws and obesity rates to identify substitution patterns between living and cadaveric kidney donors. Using panel data from 1988-2008, we find that a 1% decrease in the supply of cadaveric donors per 100,000 increases the supply of living donors per 100,000 by .7%. With respect to traffic safety laws, a national adoption of partial helmet laws is estimated to decrease cadaveric donors by 6%, but leads to a 4.2% increase in the number of living donors, or a net effect of 1.8% decrease in the supply of kidney donations. The recent rise in obesity rates is estimated to increase living donor rates by roughly 18%. Lastly, we find evidence that increases in disposable income per capita is associated with an increase in the number of non-biological living donors within a state, but is not found to have an effect on biological donor rates.