On the basis of fairness heuristic theory, it is argued in this article that people especially need fairness when they are reminded about aspects of their lives that make them uncertain. It is therefore proposed that thinking about uncertainty should make fairness a more important issue to people. The findings of 3 experiments support this line of reasoning: Asking (vs. not asking) participants 2 questions that solicited their thoughts and feelings of being uncertain led to stronger effects of perceived procedural fairness on participants' affective reactions toward the way they were treated. It is argued that these findings suggest that fairness matters to people especially when they are trying to deal with things that make them uncertain. An implication of the current findings therefore may be that fairness is important to people because it gives them an opportunity to manage uncertain aspects of their lives.
On the basis of fairness heuristic theory, the authors provide an explanation of the frequently replicated fair process effect (the finding that perceived procedural fairness positively affects how people react to outcomes). The authors argue that, in many situations, people may find it difficult to assess whether their outcome is fair or unfair and satisfying or unsatisfying because they only have information about their own outcome and they do not know the outcomes of others and that, in these situations, people use the fairness of the procedure as a heuristic substitute to assess how to judge their outcome. The results of 2 experiments corroborate the authors' line of reasoning. Findings are discussed in terms of recent developments toward an integration of the procedural and distributive justice domains.
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