Parag A. Pathak , Alex Rees-Jones, and Tayfun Sönmez
Affirmative action policies are often implemented through reserve systems. In this study, the authors demonstrate that reserve systems face widespread misunderstanding by the public. This misunderstanding can lead individuals to support policies that ineffectively pursue their interests. To establish these claims, the authors present 1,013 participants in the Understanding America Study with choices between pairs of reserve systems. Participants are members of the group receiving affirmative action and are financially incentivized to choose the system that maximizes their chance of admission. Using this data, the authors apply a novel approach to identifying the rate of uptake of different decision rules used by participants. The authors find that participants rarely use a fully optimal decision rule. In contrast, the authors find that many choices—40% in our primary estimates—are rationalized by a nearly correct decision rule, with errors driven solely by failing to appreciate the importance of processing order. Failing to account for processing order causes individuals to fail to distinguish between two policies that achieve different degrees of affirmative action: policies that provide nonbinding minimum guarantees of the number of spaces allocated and policies that provide spaces over-and-above what would be allocated absent a reserve. Confusion about the importance of processing order helps to explain otherwise surprising decisions made in field applications of reserve systems. The authors discuss implications for managers and policy makers who are trying to implement reserve systems and who are accountable to the public.
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