(with Maruyama, Eduardo & Scollard, Phoebe & Elías, Maribel & Mulangu, Francis & Seck, Abdoulaye). (2018). “Frontier Analysis and Agricultural Typologies,” Discussion Papers 270849, University of Bonn, Center for Development Research (ZEF).

(with Delgado, Luciana and Schuster, Monica). (2017). The Reality of Food Losses: A New Measurement Methodology. IFPRI Discussion Paper, 1686.

(with Miguel Almanzar). (2017). “Media Coverage and Food Commodities: Agricultural Futures Prices and Volatility Effects,” Discussion Papers 264781, University of Bonn, Center for Development Research (ZEF).

2016. Alternative Mechanisms to Reduce Food Price Volatility and Price Spikes. Sience Review:SR21. Foresight Project on Global Food and Farming Futures. Government Office for Science.

(with Nakasone, Eduardo). (2016). “Agricultural Extension through Information Technologies in Schools: Do the Cobbler’s Parents Go Barefoot?” 2016 Annual Meeting, July 31-August 2, Boston, Massachusetts 236114, Agricultural and Applied Economics Association.

(with Tanguy Bernard). (2011). Randomizing the “Last Mile.” A Methodological Note on using a voucher-based approach to assess the impact of infrastructure projects. IFPRI Discussion Paper 1078. Washington D.C. International Food Policy Research Institute.

(with Manuel Hernandez). (2011). Fertilizer Market Situation. Market Structure, Consumption and Trade Patterns, and Pricing Behavior. IFPRI Discussion Paper 1058.  International Food Policy Research Institute.

(with Manuel Hernandez). (2010). Examining the Dynamic Relationship between Spot and Future Prices of Agricultural Commodities.  IFPRI Discussion Paper No. 988. Washington, D.C. International Food Policy Research Institute (IFPRI)

(with Ekin Birol and Devesh Roy). (2010). How Safe Is My Food? : Assessing the Effect of Information and Credible Certification on Consumer Demand for Food Safety in Developing Countries. IFPRI Discussion Paper 1029. Washington, D.C. International Food Policy Research Institute (IFPRI).

(with Tanguy Bernard). (2010). Welfare impact of Rural Electrification, “Short term” evidence from Ethiopia. IFPRI.

(with Jansen, H.G.P., S. Morley, G. Kessler, V. Piñeiro, M. Sánchez). (2007). The Impact of the Central America Free Trade Agreement on the Central American Textile Maquila Industry. IFPRI Discussion Paper no. 720.  Washington D.C.: International Food Policy Research Institute (IFPRI).

(with Castillo, M., R. Petrie ).(2007). Social Barriers to Cooperation: Experiments on the Extent and Nature of Discrimination in Peru.” EXCEN Working Paper 2007-01. December 2007.

(with Alcazar, L.,and  E. Nakasone). (2007). Provision of Public Services and Welfare of the Poor: Learning from an Incomplete Electricity Privatization Process in Rural Peru. IDB Discussion Paper R526. Washington, D.C: Inter-American Development Bank.

(with Alfred J. Field and Erica Field). (2006). Property Rights and Crop Choice in Rural Peru, 1994- 2004. MTID Discussion paper No. 100. IFPRI.

(with Javier Escobal). Access to Dynamic Markets for Small Commercial Farmers: The Case of Potato Production in the Peruvian Andes. MTID Discussion Paper No. 99. IFPRI.

(with Erica Field). (2005). “Do Property Titles Increase Credit Access Among the Urban Poor? Evidence from a Nationwide Titling Program,” coauthored with Erica Field from University of Harvard, and was accepted at the AER Meetings.

(with Chowdhury, S., and A. Negassa). (2005). Market Institutions: Enhancing the Value of Urban-Rural Links. IFPRI discussion Paper No. 195.

(with Moreno, Martin & Ñopo, Hugo & Saavedra, Jaime). (2004). Gender and Racial Discrimination in Hiring: A Pseudo Audit Study for Three Selected Occupations in Metropolitan Lima, IZA Discussion Papers with number 979.

(with Hugo Nopo and Jaime Saavedra).  (2003). Ethnicity and Earnings in Urban Peru. IZA DP No. 980.

(with Javier Escobal). (2003). Adverse Geography and Differences in Welfare in Peru. Torero. WIDER discussion paper No. 2003/73.

(with Orden, David, and Ashok Gulati). (2004). “Agricultural Markets and the Rural Poor,” Draft Background Paper for the OECD Poverty Reduction Network (POVNET) Agriculture Task Force. OECD Internal Document DCD/DAC/POVNET/A(2004)1/RD3.