“Life-Cycle Investing and Leverage: Buying Stock on Margin Can Reduce Retirement Risk” (with Ian Ayres), NBER Working Paper No. W14094.

“Competing Complements” (with Ramon Casadesus-Masanell and David Yoffie), NET Institute Working Paper No. 07-44.

“One-Way Essential Complements” (with Keith Chen), Cowles Foundation Discussion Paper No. 1588; Yale Economic Applications and Policy Discussion Paper No. 22.

“Bundling as a Way to Leverage Monopoly,” Yale SOM Working Paper No. ES-36.

“Equilibrium Unemployment as a Worker Screening Device” (with Andrés Rodriguéz and Joseph Stiglitz), NBER Discussion paper #4357.

“On a Fundamental Conflict Between Equity and Efficiency” (with John Geanakoplos), Princeton University Discussion paper #137.

“Revenge and Rational Play” (with Martin Shubik), Princeton University Discussion paper #138.

“Prices and Qualities” (with Joseph Stiglitz), Princeton University Econometric Research program Discussion paper #297.

“The Ambiguous Antitrust Implications of Information Sharing” (with Richard Zeckhauser), Princeton University Discussion paper #106 (with Richard Zeckhauser).