Didn't some economists claim exactly that? "economic man, is the portrayal of humans as agents who are consistently rational, narrowly self-interested, and who

Didn't some economists claim exactly that? "economic man, is the portrayal of humans as agents who are consistently rational, narrowly self-interested, and who pursue their subjectively-defined ends optimally" https://en.wikipedia.org/wiki/Homo_economicus https://en.wikipedia.org/wiki/Homo_economicus