Zapata, Samuel D.

January, 2024

By: Zapata, Samuel D.; Carpio, Carlos E.
This study introduces distribution-free methods to estimate interval-censored willingness-to-pay (WTP) models. The approaches proposed encompass the recovery of WTP values using an iterated conditional expectation procedure and subsequent estimation of the mean WTP using parametric and nonparametric models. Methods allow us to estimate the effects of covariates on the mean WTP and the underlying probability distribution. We employ Monte Carlo simulations to compare the performance of the estimators proposed against standard parametric and nonparametric estimators. We illustrate the estimation techniques by assessing producersÕ WTP for services provided by an e-marketing website that helps connect farmers with local consumers.

May, 2022

By: Zapata, Samuel D. ; Peguero, Felipe ; SŽtamou, Mamoudou ; Alabi, Olufemi
Citrus greening (HLB) is an incurable bacterial disease severely affecting most citrus production regions. Evaluating the economic feasibility of control practices is challenging due to the complex intertemporal interactions among the pathogen, the vector, and the host. We propose a stochastic evaluation framework to systematically analyze the long-term economic performance of a broad range of management strategies. Different control approaches are evaluated in a hypothetical application in Texas. Results highlight the detrimental effects of the disease and the importance of developing cost-effective control options. A substantial loss in value is expected regardless of the intervention actions implemented.

December, 2013

By: Zapata, Samuel D.; Carpio, Carlos E.; Isengildina-Massa, Olga; Lamie, R. David
Despite the touted potential of e-commerce to improve agriculture profits, the literature on effectiveness of e-commerce is very limited. This paper assesses the economic impact of an electronic trade platform (i.e., MarketMaker) on agricultural producers. Contingent valuation techniques are employed to estimate the monetary value that producers placed on MarketMaker services. Results indicate that producers are willing to pay $47.02 annually for the services they receive. Registration type, amount of time registered, amount of time devoted to MarketMaker, type of user, number of marketing contacts received, and firm total annual sales have a significant effect on producers’ willingness to pay.