In Fig. 3, are dispositions a moderator or a mediator?

They are a moderator. They explain when work events influence affective reactions. Notice that the arrow from dispositions points to the arrow connecting work events to affective responses. Thus, dispositions are hypothesized to affect that relationship. Essentially the model says that the relationship between things that happen at work and emotional responses depends upon stable aspects of a person's personality. Not everyone will emotionally react the same way to a particular work event.. Dispositions also are predicted to have a main effect on affective responses.