手法を比較

	ベイジアン・ナッシュ均衡	プリンシパル・エージェント・モデル
分野	ゲーム理論	ゲーム理論
系統	Machine learning	Machine learning
提唱年	1967	1976
提唱者	John Harsanyi	Michael Jensen, William Meckling, Bengt Holmstrom
種類	algorithm	algorithm
原典	Harsanyi, J. C. (1967). Games with incomplete information played by Bayesian players, Parts I, II, and III. Management Science, 14(3), 159-182.	Jensen, M. C., & Meckling, W. H. (1976). Theory of the firm: Managerial behavior, agency costs and ownership structure. Journal of Financial Economics, 3(4), 305-360.
別名	BNE, Perfect Bayesian Equilibrium, Type-Contingent Equilibrium	Agency Theory, Hidden Action Problem, Moral Hazard
関連	4	4
概要	Bayesian Nash Equilibrium (BNE) extends Nash Equilibrium to games with incomplete information, where players lack full knowledge of others' payoff functions. Introduced by John Harsanyi in 1967, BNE models strategic interaction under uncertainty by representing unknown payoffs as players' private types drawn from a probability distribution. Equilibrium is found by solving for type-contingent strategies that are best responses to all possible type realizations.	The Principal-Agent Model analyzes how a principal (e.g., owner, employer, policymaker) can incentivize an agent (e.g., manager, employee, firm) to act in the principal's interest when the agent has private information or can take hidden actions. Formalized by Jensen and Meckling in 1976, the model identifies agency costs arising from moral hazard (the agent exerts less effort than desired) and adverse selection (the agent hides unfavorable information). Optimal contracts balance incentives with risk allocation.