Hypnotic ingroup-outgroup suggestion influences economic decision-making in an Ultimatum Game

► Hypnotic ingroup-outgroup suggestion modulates the acceptance of unfair offers in an economic bargaining scenario. ► Hypnotic ingroup suggestion increases tolerance of unfairness, whereas outgroup suggestion decreases acceptance of unfairness. ► Being in a hypnotic state alone has limited effect on fairness tolerance in economic bargaining. ► Response to social rule violations can be manipulated by hypnosis.