作者：Anderson, Michael L.; Auffhammer, Maximilian
作者单位：University of California System; University of California Berkeley; National Bureau of Economic Research
摘要：Heavier vehicles are safer for their own occupants but more hazardous for other vehicles. Simple theory thus suggests that an unregulated vehicle fleet is inefficiently heavy. Using three separate identification strategies we show that, controlling for own-vehicle weight, being hit by a vehicle that is 1000 pounds heavier generates a 40-50% increase in fatality risk. These results imply a total accident-related externality that exceeds the estimated social cost of US carbon emissions and is eq...
作者：Belloni, Alexandre; Chernozhukov, Victor; Hansen, Christian
作者单位：Duke University; Massachusetts Institute of Technology (MIT); University of Chicago
摘要：We propose robust methods for inference about the effect of a treatment variable on a scalar outcome in the presence of very many regressors in a model with possibly non-Gaussian and heteroscedastic disturbances. We allow for the number of regressors to be larger than the sample size. To make informative inference feasible, we require the model to be approximately sparse; that is, we require that the effect of confounding factors can be controlled for up to a small approximation error by inclu...
