In this thesis my goal has been to test whether the negative feelings which arise from being treated unfairly linger on or fade quickly. My hypothesis has been that the feelings do, in fact, disappear rather fast, and to test this I conducted two experiment sessions where I tried to induce the proposers in an ultimatum game to behave in an unfair manner in order to test how the responders reacted to this. In the test session the responders experienced a three-minute delay before their decisions were made, and in the control session the decision was to be made immediately. The results show that 73 % of the responders who were given the unfair offer in the test group accepted this offer, whereas this share was only 31 % in the control group. By themselves these numbers clearly support my hypothesis, and the findings were also significant. However, as this was a pre-test of the hypothesis for my supervisor the number of participants in the experiment was low, so the experiment needs to be conducted with more participants and sessions in order to find more robust results. All in all my findings suggest that continued research in this area should be considered.