Is There a Policy That Reduces Mass Public Shooting Deaths?

Abstract

The fact that an individual is willing to commit the most serious crime that carries with it the most serious punishment means that that person is unlikely to be deterred by laws with less serious consequences. This situation is compounded by the fact that many multiple victim public shooters are expecting, even planning, to die in the commission of their crimes. Combining newly developed and traditional difference-in-differences methodologies, we analyze several policies that have been suggested as possibly effective in reducing deaths due to mass public shootings. We find that none of the proposed policies significantly reduce such deaths. However, we find evidence that mass public shooting deaths are lower in places that allow the carrying of concealed firearms.