Robert Wright talks in this video about non-zero sum games. These games are when the outcome for two people (or groups) is correlated. That is, if one player wins, the other one wins too (if one loses, the other one loses too). The analogue to that is the zero-sum game in which one person wins and the other person loses.

Often, situations are thought to be zero sum games when in actuality they can have more than one winner. Robert Wright discusses how working toward the mutual benefit can bring about great change. That is, many events are non-zero sum, so that our cooperation brings about a better good for all players.