Summary and Keywords
The representativeness heuristic was defined by Kahneman and Tversky as a decision-making shortcut in which people judge probabilities “by the degree to which A is representative of B, that is, by the degree to which A resembles B.” People who use this cognitive shortcut bypass more detailed processing of the likelihood of the event in question but instead focus on what (stereotypic) category it appears to fit and the associations they have about that category. Simply put: If it looks like a duck, it probably is a duck. The representativeness heuristic usually works well and provides valid inferences about likelihood. This is why political scientists saw it as an important part of a solution to an enduring problem in their field: How can people make political decisions when so many studies show they lack even basic knowledge about politics? According to these scholars, voters do not need to be aware of all actions and opinions of a political candidate running for office. To make up their mind on who to vote for, they can rely on cues that represent the performance and issue position of candidates, such as the party they are affiliated with, their ranking in the polls, and whether (for instance) they act/appear presidential. In other words, they need to answer the question: Does this candidate fit my image of a successful president? The resulting low-information rationality provides voters with much confidence in their voting decision, even though they do not know all the details about the history of each candidate. Using heuristics allows relatively uninformed citizens to act as if they were fully informed.
Despite this optimistic view of heuristics at their introduction to the discipline, they originated from research showing how heuristic use is accompanied by systematic error. Tversky and Kahneman argue that using the representativeness heuristic leads to an overreliance on similarity to a category and a neglect of prior probability, sample size, and the reliability and validity of the available cue. Kuklinsky and Quirk first warned about the potential effect of these biases in the context of political decision-making. Current research often examines the effects of specific cues/stereotypes, like party, gender, race, class, or more context-specific heuristics like the deservingness heuristic. Another strand of research has started exploring the effect of the representativeness heuristic on decision-making by political elites, rather than voters. Future studies can integrate these findings to work toward a fuller understanding of the effects of the representativeness heuristic in political decision-making, more closely consider individual differences and the effects of different contexts, and map the consequences that related systematic biases might have.
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