Most of the population can be categorized within four basic personality types, according to a new study.
Researchers in Spain analyzed the responses of hundreds of volunteers to various social dilemmas, and developed an algorithm to classify their behaviour.
The algorithm determined that 90 percent of people can be considered either optimistic, pessimistic, trusting, or envious – and the rest behave in a way that falls outside of the defined models.
Read more of the original article from DailyMail.
