Economists Astrid Hopfensitz from the Toulouse School of Economics and the Institute for Advanced Study in Toulouse and Cesar Mantilla from the Universidad del Rosario published a study in the Journal of Economic Psychology, a leading Economic and Psychology journal, showing that performance in the FIFA World Cups from 1970 to 2014 is correlated with how angry or happy players looked in the famous Panini World Cup sticker album.

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