Cooperative behavior is common in nature even if selfishness is sometimes better for an individual. Empirical and theoretical studies have shown that the invasion and expansion of cooperators are related to an inhomogeneous connectivity distribution. Here we study the evolution of cooperation on...

This paper shows a positive public financing shock has heterogeneous effects on academic achievement. White students show meaningful improvement, but Black and Hispanic students do not. Consequently, the achievement racial gap widens following the shock. Changes in school funding do not explain...