Summary: The outcome bias is an error made in evaluating the quality of a decision when the outcome of that decision is already known.

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No harm, no foul: The outcome bias in ethical judgments

We present six studies demonstrating that outcome information biases ethical judgments of others’ ethically-questionable behaviors. In particular, we show that the same behaviors produce more ethical condemnation when they happen to produce bad rather than good outcomes, even if the outcomes are determined by chance. Our studies show that individuals judge behaviors as less ethical, more blameworthy, and punish them more harshly, when such behaviors led to undesirable consequences, even if they saw those behaviors as acceptable before they knew its consequences. Furthermore, our results demonstrate that a rational, analytic mindset can override the effects of one’s intuitions in ethical judgments. Implications for both research and practice are discussed.

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Outcome bias in decision evaluation.

In 5 studies, undergraduate subjects were given descriptions and outcomes of decisions made by others under conditions of uncertainty. Decisions concerned either medical matters or monetary gambles. Subjects rated the quality of thinking of the decisions, the competence of the decision maker, or their willingness to let the decision maker decide on their behalf. Subjects understood that they had all relevant information available to the decision maker. Subjects rated the thinking as better, rated the decision maker as more competent, or indicated greater willingness to yield the decision when the outcome was favorable than when it was unfavorable.

In monetary gambles, subjects rated the thinking as better when the outcome of the option not chosen turned out poorly than when it turned out well. Although subjects who were asked felt that they should not consider outcomes in making these evaluations, they did so. This effect of outcome knowledge on evaluation may be explained partly in terms of its effect on the salience of arguments for each side of the choice. Implications for the theory of rationality and for practical situations are discussed.

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