Before revision: We study the informed principal problems in a  bilateral trade environment where both seller and buyer have private information about the types affecting their interdependent valuations. The seller has full bargaining power to offer a trading mechanism. We refine equilibria by the intuitive criterion.
After revision: We study the informed principal problems in a bilateral trade environment with interdependent values. This interdependency causes the problem of multiple equilibria in the mechanism-selection game, while bilateral asymmetric information creates some difficulties in refinement analyses. Applying general methodologies of mechanism design, we show that only the principal's worst equilibrium allocation survives the intuitive criterion.