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 the information design problem in a single-unit auction setting. The information designer controls independent private signals according to which the buyers infer their binary private value. Assuming that the seller adopts Myerson (1981) optimal auction in response, we characterize both...