Be Nice

In the long run, it pays to be nice says a new Harvard study.

Common game theory has held that punishment makes two equals cooperate. But when people compete in repeated games, punishment fails to deliver, said study author Martin Nowak. He is director of the evolutionary dynamics lab at Harvard where the study was conducted.

"On the individual level, we find that those who use punishments are the losers," Nowak said his experiments found.

Those who escalate the conflict very often wound up doomed.

"It's a very positive message," said study co-author David Rand, a Harvard biology graduate student researcher. "In general, the thing that is most, sort of, rational and best for your own self-interest is to be nice."