COVID-19 vaccines are widely available in wealthy countries, yet many people remain unvaccinated. Understanding the effectiveness -- or lack thereof -- of popular vaccination campaign strategies is therefore critical. In this paper, we report results from two studies that tested strategies...

We are five years away from 2015, the year when the Millennium Development Goal of universal education is supposed to be achieved, and the school attendance numbers do look good. In many parts of both East and West Africa, and almost all of South Asia, school enrollment has grown rapidly, with...

We explore a model of non-Bayesian information aggregation in networks. Agents non-cooperatively choose among Friedkin-Johnsen type aggregation rules to maximize payoffs. The DeGroot rule is chosen in equilibrium if and only if there is noiseless information transmission...leading to consensus....