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Information Design for Congested Social Services: Optimal Need-Based Persuasion

05/14/2020
by   Jerry Anunrojwong, et al.
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We study the effectiveness of information design in reducing congestion in social services catering to users with varied levels of need. In the absence of price discrimination and centralized admission, the provider relies on sharing information about wait times to improve welfare. We consider a stylized model with heterogeneous users who differ in their private outside options: low-need users have an acceptable outside option to the social service, whereas high-need users have no viable outside option. Upon arrival, a user decides to wait for the service by joining an unobservable first-come-first-serve queue, or leave and seek her outside option. To reduce congestion and improve social outcomes, the service provider seeks to persuade more low-need users to avail their outside option, and thus better serve high-need users. We characterize the Pareto-optimal signaling mechanisms and compare their welfare outcomes against several benchmarks. We show that if either type is the overwhelming majority of the population, information design does not provide improvement over sharing full information or no information. On the other hand, when the population is a mixture of the two types, information design not only Pareto dominates full-information and no-information mechanisms, in some regimes it also achieves the same welfare as the "first-best", i.e., the Pareto-optimal centralized admission policy with knowledge of users' types.

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