In this paper, we study the dynamics of legal rules in a model with two nation-states playing a non cooperative game. For each country, changing the legal system is a costly process. At the same time, the existence of different legal systems is also costly for all nation-states. We show that...

Why did the world succeed in eradicating smallpox? Though eradication is a global public good, theory suggests that it should not have been vulnerable to free riding. Some countries, however, lacked the capacity to eliminate smallpox. Success thus depended on the other countries providing...