Working Papers

The Roots of Agricultural Innovation: Evidence from Patents (latest version here). With Paul Heisey, Yongjie Ji, and GianCarlo Moschini. Presented at the 2019 NBER Conference on The Economics of Research and Innovation in Agriculture in Washington, D.C.

How Deep are the Roots of Agricultural Innovation? Evidence from Patents. Presented at the 2017 AAEA Annual Meeting in Washington, DC.

Eating the Seed Corn? The Impact of Generic Drug Entry on Innovation in Animal Health. With Stacy Sneeringer. Presented at the 2017 AAEA Annual Meeting in Washington, DC.

Pushing and Pulling Environmental Innovation: R&D Subsidies and Carbon Taxes. With GianCarlo Moschini. Presented at the 2016 AAEA Annual Meeting in Washington, DC.

Published and Peer Reviewed

How Much Does it Cost to Induce R&D in Animal Health? With Stacy Sneeringer. Applied Economic Perspectives and Policy (Forthcoming).

The U.S. and EU Animal Pharmaceutical Industries in the Age of Antibiotic Resistance. With Stacy Sneeringer and Maria Bowman. USDA Economic Research Report 264.

Inventing by Combining Pre-Existing Technologies: Patent Evidence on Learning and Fishing Out. Research Policy (2017) 47(1), 252-265. [Pre-print] [Video Summary]

Combinations of technology in US Patents, 1926-2009: A Weakening Base for Future Innovation? Economics of Innovation and New Technology (2017). [Pre-print] [Video Summary]

Mandates and the Incentive for Environmental Innovation. With GianCarlo Moschini. Forthcoming in the American Journal of Agricultural Economics[Pre-print] [simulation code]

Intellectual Property Rights and the Ascent of Proprietary Innovation in Agriculture.  With GianCarlo Moschini. Annual Review of Resource Economics (2017) 9, 53-74. [Pre-print]

Research, Productivity, and Output Growth in U.S. Agriculture. With Keith Fuglie, Paul Heisey, and James MacDonald. Journal of Agricultural and Applied Economics (2017), 1-41.

Private Sector Research and Development. With Keith Fuglie, and Paul W. Heisey. Chapter in Handbook of Agriscience and Agribusiness, ed. N. Kalaitzandonakes (Forthcoming).

Incentives for Innovation: Patents, Prizes, and Research Contracts. With GianCarlo Moschini. Applied Economic Perspectives and Policy (2013) 35(2): 206-241. *winner of the 2013 Outstanding AEPP article.


An open toolkit for tracking open science partnership implementation and impact. With many others.

U.S. Agricultural R&D in an Era of Falling Public Funding. With Keith Fuglie and Paul Heisey. Amber Waves.