A new European study on human behaviour suggests that people can be divided into one of four main personality types — with 'Envious' being the most common.
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The new research, carried out by a team of researchers from Universidad Carlos III de Madrid and the universities of Barcelona, Rovira i Virgili and Zaragoza, Spain, presented 541 volunteers with hundreds of social dilemmas and asked them to report on what they would do in each situation.
Participants had to make decisions based on individual or group interests, which would lead to either collaboration or conflict with others.