This note derives the dynamic programming equation (DPE) to a differentiable Markov Perfect equilibrium in a problem with non-constant discounting and general functional forms. Beginning with a discrete stage model and taking the limit as the length of the stage goes to 0 leads to the DPE...

Recent papers show that imperfect property rights to a natural resource--a sector-specific factor--can be a source of comparative advantage. in these models, weaker property rights attract labor--the only mobile factor--to the resource sector, increasing the country's comparative advantage for...

In familiar models, a decrease in the friction facing mobile factors (e.g., lowering their adjustment costs) increases a coordination problem, leading to more circumstances where there are multiple equilibria. We show that a decrease in friction can decrease coordination problems if, for...