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Technology and Technical Efficiency Change: Evidence from a Difference in Differences Selectivity Corrected Stochastic Production Frontier Model

Boris E. Bravo‐Ureta, Mario González‐Flores, William Greene and Daniel Solís
Authors registered in the RePEc Author Service: Mario González Flores

American Journal of Agricultural Economics, 2021, vol. 103, issue 1, 362-385

Abstract: This study presents a new approach to evaluate the economic impact of development projects for cases where baseline and endline data for comparable treated and control samples are available. An important contribution is to bring together propensity score matching (PSM) and difference‐in‐differences (DID) techniques, commonly used in impact evaluation studies, with stochastic production frontiers (SPF) that have become well‐established in the productivity literature. To illustrate our proposed framework, we use baseline and endline data from a rural environmental development program implemented in Nicaragua between 2012 and 2016. The results support the use of the approach proposed and reveal that selectivity from unobservables can be significant. The analysis shows that a severe drought over the period analyzed had significant negative effects on both control and treated farms. However, project beneficiaries enjoyed significantly better results, attributable to the project, compared to the control group. Overall, the results exhibit relatively low levels of technical efficiency with no significant variation across models, time, and treatment status.

Date: 2021
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https://doi.org/10.1111/ajae.12112

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