Drunk driving on Super Bowl Sunday has long been linked to increased motor vehicle crash rates, but to date this claim has not been rigorously examined. This paper seeks to fill this gap by providing causal evidence of the effect of drunk driving on Super Bowl Sunday on fatal crashes using hourly variation across 42 Super Bowls and regression discontinuity modeling. I find the Super Bowl increases motor vehicle fatalities by 17% at an annual social cost of $161 million within a single 24-hour period. Restricting alcohol purchases for off-premises consumption on game day magnifies this effect: states with blue laws in effect experience twice the increase in impaired fatal crashes, but no difference in non-impaired crashes, and no difference in impaired crashes in the years post-repeal. Lastly, winning the Super Bowl causes higher fatality rates than losing, but upset losses are comparatively more costly than upset victories. My results document substantial externalities from drinking and driving on the Super Bowl and highlight the unintended consequences of policies that shift alcohol consumption towards higher-risk environments.
"Pharmaceutical Drug Regulation and Mortality: Evidence from E-cigarettes" (with Michael Pesko) Under Review
Media Highlights: Marginal Revolution, Vox, National Affairs
This study evaluates drug regulation in the United States by examining the effects of the unexpected judicial exemption of e--cigarettes from drug regulation, compared to nicotine replacement therapy, which remained regulated as a drug. We find that this exemption led to significant increases in innovation, as evidenced by a rise in patent applications. Using variation in smoking rates across demographic groups prior to e-cigarette introduction, we estimate that from 2011 to 2019, e-cigarettes saved 677,000 life-years-approximately one-third of the estimated benefit of early HIV/AIDS drugs by year 2000-and increased social surplus by $8 billion annually. We show that reduced smoking is a key mechanism behind this mortality reduction, with statistically significant declines in mortality lagging smoking reductions by approximately four years.
"Ridesharing and External-Cause Mortality" (with Keith Teltser and Conor Lennon) Under Review
Media Highlights: National Affairs
Existing research suggests ridesharing affects transportation access, substance use, and exposure to crime. Ridesharing may therefore also have meaningful effects on mortality related to these underlying factors. To address this question, we use restricted-access data from the National Vital Statistics System to study how ridesharing affects mortality from external causes. Our identification strategy relies on spatial and temporal variation in UberX entry across U.S. counties. Among those aged 18 to 45, we find that UberX entry into an area is associated with 2.01 additional deaths per quarter per 100,000 population (roughly a 10% increase). We find that these deaths are primarily related to alcohol and drug use. We support a causal interpretation for our findings by presenting event studies, placebo analyses, sensitivity and heterogeneity analyses, and a variety of robustness checks, including differences-in-differences estimators that are robust to heterogeneous treatment effects. Our work contributes to the literature by addressing both the benefits and costs of ridesharing, and by informing stakeholders who are interested in the cumulative impact of ridesharing on public health and well-being.