We revisit the idea that robustness concerns can provide a foundation for simple mechanisms. Formally, we consider the robust implementation notion of continuous implementation (Oury and Tercieux, 2012), where continuity is with respect to players' hierarchy of beliefs. We define simplicity as...

We study a general social choice environment that has multiple agents, a finite set of alternatives, and independent and diffuse information. We show that for any Bayesian incentive compatible mechanism, there exists a deterministic mechanism that i) is Bayesian incentive compatible; ii) delivers...