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	最後通牒ゲーム	独裁者ゲーム（Dictator Game）
分野	心理学	心理学
系統	Hypothesis test	Hypothesis test
提唱年	1982	1994
提唱者	Werner Güth, Rolf Schmittberger, and Bernd Schwarze	Robert Forsythe and colleagues
種類	Behavioral economics task	Allocation task
原典	Güth, W., Schmittberger, R., & Schwarze, B. (1982). An experimental analysis of ultimatum bargaining. Journal of Economic Behavior & Organization, 3(4), 367-388.	Forsythe, R., Horowitz, J. L., Savin, N. E., & Sefton, M. (1994). Fairness in simple bargaining experiments. Games and Economic Behavior, 6(3), 347-369.
別名	Ultimatum Bargaining, Division Game	Allocation Game, Distribution Task
関連	1	1
概要	The Ultimatum Game is a two-player economic decision-making task that reveals preferences for fairness and social norms. One player (proposer) receives money and offers a portion to a second player (responder). The responder accepts or rejects the offer; if accepted, both receive their share; if rejected, both receive nothing. Economic theory predicts responders should accept any positive offer (better than zero), yet responders often reject unfair offers. This gap between predictions and behavior reveals that fairness concerns, equity sensitivity, and social punishment shape economic decisions.	The Dictator Game is a simple economic decision task measuring generosity and prosocial behavior. One player (dictator) receives money and unilaterally decides how to allocate it between themselves and an anonymous second player (recipient). The recipient cannot reject the offer; they simply receive what the dictator gives. Unlike the Ultimatum Game, the dictator faces no punishment for selfishness. Thus, the Dictator Game reveals baseline generosity without strategic calculation, revealing intrinsic prosocial preferences.