Good Markets Make Bad Neighbors Regulating Open-Air Drug Markets

In their manuscript, Corsaro, Hunt, Kroovand Hipple, and McGarrell (2012, this issue) provide a valuable contribution to the literature regarding focused deterrence with an econometric evaluation of the High Point Drug Market Intervention (DMI). By employing a difference-in-difference Poisson panel regression framework, as well as group-based trajectory analyses, these authors examine the High Point DMI’s likely impact on neighborhood violence. Intheirmainresult,Corsaroetal.(2012)findanincidencerateratioof0.854inviolent crime incidence within the targeted intervention areas—roughly speaking, a 14% decline. These authors also find no statistically significant change (indeed some decline) in nearby neighborhoods associated with the intervention, allaying concerns that the DMI simply displaced criminal activity from targeted areas to nearby communities. These findings seem statistically credible. Point estimates are robust to a variety of sensitivity analyses. The Corsaro et al. (2012) article provides a valuable contribution to the literature