In the KLab, experiments are carried out in which the participants make certain decisions under controlled conditions that influence their profit. We try to learn from the decisions how people behave in certain situations. At the beginning, the participants receive precise instructions describing what their task is and how the decisions affect their profit. Sometimes it is not only their own decisions that are decisive for winning, but also the decisions of other participants or even luck or bad luck. So sometimes there is more and sometimes less money.