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STOCKHOLM: Economists David Card, Joshua Angrist and Guido Imbens won the 2021 Nobel economics prize on Monday for pioneering "natural experiments" to show real-world economic impacts in areas from minimum wage increases in the U.S. fast-food sector to migration from Castro-era Cuba.

Unlike in medicine or other sciences, economists cannot conduct rigidly controlled clinical trials. Instead, natural experiments use real-life situations to study impacts on the world, an approach that has spread to other social sciences.

"Their research has substantially improved our ability to answer key causal questions, which has been of great benefit to society," says Peter Fredriksson, chair of the Economic Sciences Prize Committee.

Trio win physics Nobel for work deciphering chaotic climate

Past Nobel Economics prizes have been dominated by U.S. institutions and this was no exception. Canada-born Card currently works at the University of California, Berkeley; Angrist, a dual U.S. and Israeli citizen, at Massachusetts Institute of Technology; and Dutch-born Imbens at Stanford University.

One experiment by Card on the impact on the fast-food sector of a minimum wage increase in the U.S. state of New Jersey in the early 1990s upended conventional wisdom in economics that such increases should always lead to job losses.

His work on the topic, often in collaboration with prominent economist, Alan Krueger, who died in 2019, has been used as empirical evidence to push for legislation, including by the Biden administration, for a $15 minimum wage in the United States.

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