Murf quoted Humankind by Rudger Bregman
Homo economicus, it turns out, is not a human, but a chimpanzee. ‘The canonical predictions of the Homo economicus model have proved remarkably successful in predicting chimpanzee behaviour in simple experiments,’ Henrich noted dryly. ‘So, all theoretical work was not wasted, it was just applied to the wrong species.’
— Humankind by Rudger Bregman (Page 16)
The idea that humans are rational, selfish, economic actors - Homo Economicus.