A recent game theory study on human behavior reports that feeling envious—which was characterized by not caring what you achieve or possess, as long as it’s better than everyone else—was the most prevalent of four basic personality types. In fact, 30 percent of participants were driven primarily by envy, while the personality traits of being pessimistic, optimistic or trusting all scored about 20 percent.

The September 2016 study, “Humans Display a Reduced Set of Consistent Behavioral Phenotypes in Dyadic Games,” appears in the journal Science Advances.

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