This comment discusses the pros and cons of the methodology and data used in our previous study on the cost-effectiveness of armor on Tactical Wheeled Vehicles (TWVs), and responds to recent critiques by Franz Gayl. In our previous article, we evaluated the large-scale Army policies to replace...

Due to federal regulations, automobile air bag availability was a model-specific discontinuous function of model year for used vehicles in the 1990s and early 2000s. We use the discontinuities and the gradual increase in the supply of air bags to trace out the demand curve for air bags and the...

This paper examines the effect of a short-term change in preference for male offspring on couples' childbearing and child-avoidance behaviors. We exploit a natural experiment in Japan in which girls born in a specific astrological year are regarded as less desirable. We relate this superstition...

This study uses for official use only data on US military operations to evaluate the large-scale Army policies to replace relatively light Type 1 tactical wheeled vehicles (TWVs) with more heavily protected Type 2 variants and later to replace Type 2s with more heavily protected Type 3s. We find...

This study exploits the differential effects of the Vietnam War across birth cohorts to measure the effects of combat exposure on later violence and crime. Combat exposure and violent acts are measured using self-reports from the National Vietnam Veterans Readjustment Study. I find large...