"Spieltheorie" . . "Kooperation" . . . . "Test" . . . . . . . . . . . . "The frames behind the games : player's perceptions of prisoner's dilemma, chicken, dictator and ultimatum games" . . . . . "The frames behind the games : player's perceptions of prisoner's dilemma, chicken, dictator, and ultimatum games" . "Eigeninteresse" . . "Verhaltensökonomik" . .