Negative expectations can have both costs and benefits:
1) Negative expectations produce a cost in the pre-event period by making people feel worse while anticipating a negative event.
2) Negative expectations may provide a benefit in the post-event period by attenuating negative feelings if the event turns out badly.
3) However, three studies found that the pre-event costs of negative expectations were greater and more consistent than any post-event benefits. In experiments and a field study, people felt worse when expecting a negative event, but their prior expectations did not influence their feelings after the event occurred.