Because of its impacts on democracy, there is an important debate on whether the recent trends towards greater use of social media increases or decreases (political) polarization. One challenge for understanding this issue is how social media affects the equilibrium prevalence of different types...

We study what is taught in core microeconomics courses at top US econ doctoral programs. We build a detailed concept map containing more than 1300 concepts, fitting under more than 100 broader topics. We find evidence of substantial diversity. Most programs cover less than 50% of the universe of...

We analyze the interaction between the incentives for free-riding and information revelation among partners in a dynamic setting. Partners contribute to the value of a common project, but have private information about the success of their own contribution efforts. The desire to maintain a...