Restricted environments and incentive compatibility in interdependent values models

We study mechanisms that operate in interdependent values environments. show when defined on knit and strict environments, only constant can be ex post incentive compatible. Knitness is also necessary for this result to hold with two alternatives the range. For partially we prove compatibility extends groups, strategy-proofness implies strong group special case of private values. The results extend operating non-strict domains under an additional requirement respectfulness. discuss examples environments where our theorems apply.