sentences:  The theory is also interrelated with a non-zero-sum game which proposes that through use of comparative advantage, all states who engage in peaceful relations and trade can expand wealth.This differs from theories that employ relative gain, which seeks to describe the actions of states only in respect to power balances and without regard to other factors, such as economics.Relative gain is related to zero-sum game, which states that wealth cannot be expanded and the only way a state can become richer is to take wealth from another state.