Chapter 10 Price Discrimination HAL R. VARIAN Chapter 11 Vertical Contractual Relations MICHAEL L. KATZ Chapter 12 Product Differentiation B. CURTIS EATON and RICHARD G. LIPSEY Chapter 13 Imperfect Information in the Product Market JOSEPH E. STIGLITZ Chap ter 14 The Timing of Innovation: Research, Development, and Diffusion JENNIFER F. REINGANUM Chapter 15 The Theory and the Facts of How Markets Clear: Is Industrial Organization Valuable for Understanding Macroeconomics? DENNIS W. CARLTON