From the perspective of actors' pursuit of rational self-interest, Gauthier's contractarianism links justice, rationality and morality, he attempts to deduce moral principles from non-moral premises by combining the method of contract theory, rational choice theory and game theory, and establish a just contract between rational actors to provide a plan of action for "How can I pursue a better life?". He tried to argue why rational actors chose to cooperate rather than from a normative point of view. He tried to prove that the actor's choice of cooperation is the result of rational choice because cooperation will improve the actor's situation. He believes that rational actors will choose to cooperate with people in a just and rational way, and rational actors will voluntarily abide by the contract and limit their behaviors in order to pursue a better social life. But his argument for cooperation lacks stability fails to fully prove why we should choose this mode of cooperation instead of that mode of cooperation and his argument for the rationality of cooperation is not convincing enough. He fails to demonstrate that collaboration is better than non-collaboration at all times, nor does he fully demonstrate that it is irrational to collaborate with actors other than constrained maximizers. Although his argument has some flaws and cannot convince all opponents, it provides us with a new answer to this question.
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