Section 1. Getting to Work: 1. Politics sets the stage; 2. Designing for multiple goals; 3. Comparing seller revenues; 4. The academic critics; 5. Plan for this book; Part I. The Mechanism Design Approach; Section 2. Vickrey-Clarke-Groves Mechanisms: 6. Formulation; 7. Always optimal and weakly dominant strategies; 8. Balancing the budget; 9. Uniqueness; 10. Disadvantages of the Vickrey auction; 11. Conclusion; Section 3. The Envelope Theorem and Payoff Equivalence: 12. Hottelling\'s lemma; 13. The envelope theorem in integral form; 14. Quasi-linear payoffs; 15. Conclusion; Section 4. Bidding Equilibrium and Revenue Differences: 16. The single crossing conditions; 17. Deriving and verifying equilibrium strategies; 18. Revenue comparisons in the benchmark model; 19. Expected-revenue maximizing auctions; 20. Conclusion; Section 5. Interdependence of Types and Values: 21. Which models and assumptions are \'useful\'?; 22. Statistical dependence and revenue-maximizing auctions; 23. Wilson\'s drainage tract model; 24. Correlated types model interdependent values; 25. Conclusion; Section 6. Auctions in Context: 26. The profit and surplus contribution of an entrant; 27. Symmetric models with costly entry; 28. Asymmetric models: devices to promote competition; 29. After the bidding ends; 30. Conclusion; Part II. Multi-Unit Auctions; Section 7. Uniform Price Auctions: 31. Uniform price sealed bid auctions; 32. Simultaneous ascending auctions; 33. Conclusion; Section 8. Package Auctions and Combinatorial Bidding: 34. Vickrey auctions and the monotonicity problems; 35. Bernheim-Whinston first-price package auctions; 36. Ausubel-Milgrom ascending proxy auctions; 37. Conclusion.