After fifteen years, NAFTA has been subject to many evaluations from different perspectives, including environmental assessments. According to the Commission for Environmental Cooperation (CEC), results of these evaluations show that, at the aggregate level, the environmental impacts of free...

The conventional wisdom is that government decentralization promotes policy innovation because it allows for several simultaneous experiments by local governments. However, there is also a learning externality because successful policy experiments provide useful information to all governments....