Mechanism Design -- Revenue Failures and Collusion in Combinatorial Auctions and Exchanges with VCG Payments -- A Mechanism for Multiple Goods and Interdependent Valuations -- A Budget-Balanced, Incentive-Compatible Scheme for Social Choice -- An Options-Based Method to Solve the Composability Problem in Sequential Auctions -- “CONFESS”. Eliciting Honest Feedback Without Independent Verific…