Mexico City's bus rapid transit (BRT) network, Metrobus, was introduced in an attempt to reduce congestion, increase city transport efficiency and cut air polluting emissions. In June 2005, the first BRT line in the metropolitan area began service. We use the differences-indifferences technique to make the first quantitative assessment of the policy impact of a BRT system on air polluting emissions. The air pollutants considered are carbon monoxide (CO), nitrogen oxides (NOX), particulate matter of less than 10 µm (PM10), and sulfur dioxide (SO2). The ex-post analysis uses real field data from air quality monitoring stations for periods before and after BRT implementation. Results show that BRT constitutes an effective environmental policy, reducing emissions of CO, NOX, and PM10.

Mexican President Felipe Calderón took office in December 2006. From the outset, his government deployed an aggressive security policy to fight drug trafficking organizations in what became known as the “Mexican Drug War.” The policy earned considerable criticism since a heavy number of unintended casualties resulted from the frontal assault waged against the drug cartels. In this article, we evaluate the effects of the Mexican Drug War on Mexican states’ economic growth. To do so, we study the effects of the rise in the homicide rate and changes in a state‐level approximation of the military budget on economic growth. Using dynamic panel data econometrics, we find that while the growth in the number of homicides had negative and significant effects on state GDP growth, state military expenditures aimed at fighting drug trafficking had a positive and significant effect on the per capita economic growth rate.