Adjective
positive-sum (not comparable)
(game theory) Pertaining to a game or situation where overall benefits to all participants can increase. [from 20th c.]
The free flow of people across borders is not to be confused with the free flow of goods across borders. Free trade is a positive-sum game. Contrary to illegal immigration, it is always invited, consensual and hence mutually beneficial to the parties involved. Ilana Mercer
If we assume that "Trade X", in which Adam trades Good A to Brian for Good B, does not benefit Adam sufficiently, Adam will ignore Trade X (and trade his Good A for something else in a different positive-sum transaction, or keep it). Source: Internet
Under coercion, the coerced party is still doing the best they can under their unfortunate circumstances, and any exchanges they make are positive-sum. Source: Internet