"Innovation and Evolution of the Payments Industry" (with D.S. Evans). In Moving Money (R.E. Litan and M.N. Baily, eds.), Washington: Brookings Institution, 2009, pp. 36-76.

"Standard-Setting, Innovation Specialists, and Competition Policy," Journal of Industrial Economics, 57 (September 2009): 526-52.

"Should New Merger Guidelines Give UPP Market Definition?" GCP: The Antitrust Chronicle, December 2009, Release 1.

"Epilogue." In Post-Kyoto International Climate Policy: Implementing Architectures for Agreement (J.E. Aldy and R.N. Stavins, eds.), Cambridge: Cambridge University Press, 2010, pp. 889-898.

"Failure to Launch: Critical Mass in Platform Businesses" (with D.S. Evans), Review of Network Economics, 9 (December 2010), Issue 4, Article 1 (26 pages).

"Jeffrey Rohlfs' 1974 Model of Facebook: An Introduction," Competition Policy International, 7 (Spring 2011): 301-12.

"Why is Platform Pricing Generally Highly Skewed?" Review of Network Economics, 10 (December 2011), Issue 4, Article 1 (11 pages).

"Gridlock in 2030?" (with T.D. Heidel and J.G. Kassakian), Public Utilities Fortnightly, 150 (January 2012): 22-28.

"Evaluating Policies to Increase the Generation of Electricity from Renewable Energy," Review of Environmental Economics and Policy, 6 (Winter 2012): 45-64.

"’On a level with Dentists?’ Reflections on the Evolution of Industrial Organization." Review of Industrial Organization, 41 (November 2012): 157-79.

"From ‘Green Growth’ to Sound Policies: An Overview," Energy Economics, 34 (Supplement 1, November 2012): S2-S6.

"The Antitrust Analysis of Multi-Sided Platform Businesses," (with David S. Evans), Revised: January 2012. Forthcoming in Roger Blair and Daniel Sokol, eds., Oxford Handbook on International Antitrust Economics, Oxford University Press.

"The SO2 Allowance Trading System: The Ironic History of a Grand Policy Experiment" (with R.N. Stavins), Journal of Economic Perspectives, 27 (Winter 2013): 103-22.

“The Performance of U.S. Wind and Solar Generating Plants,” MIT Center for Energy and Environmental Policy Research Working Paper 2013-012, September 2013.

““Deregulation: Introduction and Overview.” In The Causes and Effects of Deregulation. (2 Vols., P.W. MacAvoy and R. Schmalensee, eds.), Cheltenham, UK: Edward Elgar, 2014, pp. ix-xv.

“Don’t Give Away the Razor (Usually): A Note on Two-Part Tariffs,” Discussion Paper, June 2014.

“The Performance of U.S. Wind and Solar Generating Plants,” MIT Center for Energy and Environmental Policy Research Working Paper 2013-012, September 2013.

“Deregulation: Introduction and Overview.” In The Causes and Effects of Deregulation. (2 Vols., P.W. MacAvoy and R. Schmalensee, eds.), Cheltenham, UK: Edward Elgar, 2014, pp. ix-xv.

“Don’t Give Away the Razor (Usually): A Note on Two-Part Tariffs,” Discussion Paper, June 2014.