The Psychology of Conflict and Combat, Ben Shalit, pp. 43, Greenwood Publishing Group, 1988, ISBN 978-0-275-92753-0, ... For Baron, the conflict is always a zero-sum game: One player's gain must always mean the other player's loss. Rappaport (1964) describes the essence of a zero-sum game as that game in which, if one player can do something to hurt another, he will do so ...
Making Globalization Work, Joseph E. Stiglitz, pp. 99, W. W. Norton & Company, 2007, ISBN 978-0-393-33028-1, ... Trade is not a zero-sum game, in which those who win do so at the cost of others; it is, or least it can be, a positive-sum game, in which everyone can be a winner ...