The Nobel Memorial Prize in Economic Sciences was awarded Monday to David Card of the University of California, Berkeley, Joshua Angrist of the Massachusetts Institute of Technology and Guido Imbens ...

Regarding David Henderson’s op-ed “ ‘Natural Experiments’ Lead to an Economics Nobel” (Oct. 12): Natural experiments require circumstances in which political events, geopolitical boundaries and so ...

A natural experiment is an empirical study in which individuals (or clusters of individuals) are exposed to the experimental and control conditions that are determined by nature or by other factors ...