Managing Persuasion Robustly: The Optimality of Quota Rules

We study a sender-receiver game in which the receiver can commit to a decision rule before the sender determines the information policy.

We ask how the receiver should commit, in advance, to a rule that maps the information of the sender into decisions---when the receiver knows neither the sender's true preferences nor the full range of information the sender could supply.

To handle this dual uncertainty, we adopt a unified robust framework that nests max-min utility, min-max regret, and min-max competitive ratio as special cases.

Across all criteria, the same answer emerges: the optimal rule is always a quota rule.