Social scientists worry that too often we think only of ourselves. “There’s been an increasing recognition that over the last few decades the economy and society have become incredibly focused on the individual, to the detriment of our social fabric,” says Lily L. Tsai, the Ford Professor of Political Science at MIT. Tsai, who is also the director and founder of the MIT Governance LAB (MIT GOV/LAB) and is the current chair of the MIT faculty, is interested in distributive justice — allocating resources fairly across different groups of people….