Three Principles of Eudaimonia: Axiomatic System and Game-Theoretic Framework of Eudaimonist Ethics

In response to the paradigmatic crisis in contemporary ethics caused by the "absence of axioms," this paper proposes "Eudaimonist Ethics," which takes "eudaimonia" (human flourishing) as its logical starting point. The theory first constructs a "Eudaimonia Stratification Theory" as the psychological foundation of behavioral motivation, then rigorously deduces three fundamental principles that can serve as ethical axioms: 1) Pursue one's own eudaimonia (factual starting point); 2) Do not infringe upon the eudaimonia of others (interactive norm); 3) Jointly build an eudaimonia-conducive environment (active sublimation). From this starting point, the paper systematically derives core normative categories such as liberty, good and evil, morality, and law, and resolves boundary conflicts through the "Principle of the Concerned Party." Research demonstrates that this framework not only resolves classical dilemmas faced by utilitarianism, deontology, and virtue ethics with internal consistency but also, through its formalization as a "Eudaimonia Game" model—incorporating parameters such as the moral sentiment coefficient (f), social deterrence coefficient (w), and cooperation dividend (e)—rigorously proves that moral cooperative behavior can become a stable equilibrium within an expanded rational choice framework. Ultimately, this paper argues that the "Three Principles of Eudaimonia" constitute an operational "ethical operating system," providing a unified normative framework for individual ethical decision-making and social institutional design. This marks a paradigm shift from static rule compliance to the dynamic joint building of the environment, elevating the role of the moral agent from an 'optimal solution player' under given rules to a co-'architect' of the future order.