Josh Angrist, David Card, and Guido Imbens shared the Nobel in 2021 for their pioneering work on natural experiments that, in the words of the committee, "revolutionised empirical research". Steve Pischke tells Tim Phillips about the history of natural experiments, and the impact of the methods pioneered by this year's Laureates.
© Nobel Prize Outreach 2021 Ill. Niklas Elmehed