Pigouvian taxation to induce technological change and abate nonpoint pollution in the Ebro Basin, Spain

E. Esteban, J. Tapia, Y. Martínez, J. Albiac

Abstract


The implementation of policies to control nonpoint pollution is a complicated task because the lack of information about the biophysical processes and the asymmetric information between social planner and polluters. The objective of this paper is to evaluate the efficiency of using an input tax instrument (water tax) with a non-uniform tax rate to abate nonpoint pollution. This water tax instrument generates a reduction in the pollution level, and induces farmers to adopt abatement practices such as better irrigation technology systems. The model presents theoretically and empirically the salinity pollution problems in the Ebro Basin (Northeast of Spain). Farmers are heterogeneous in crop types, irrigation technologies, and biophysical field characteristics. Because of this heterogeneity each farmer generates a different level of emissions, so farmers should be taxed differently. In this analysis, the social planner implements two tax rates according with farmers’ irrigation technology. Using a non-uniform tax rate, pollution emissions are reduced and farmers are induced to change their irrigation technology towards a more efficient one. The use of a more efficient irrigation technology increases social welfare and generates a cutback in the emission loads.


Keywords


bioeconomic model; heterogeneous farmers; irrigation-based water tax; salinity; water pollution

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References


Alberto F., Aragües R., Quílez D., 1986. Balance de sales en la Cuenca del Ebro. In: Sistema integrado del Ebro-Estudio interdisciplinar (Mari-o M., ed.), Zaragoza. ISBN: 84-398-7293-3. [In Spanish].

Bennear L., Stavins R., 2007. Second-best theory and the use of multiple policy instruments. Environ Resour Econ 37, 111-129. http://dx.doi.org/10.1007/s10640-007-9110-y

Griffin R., Bromley D., 1982. Agricultural Runoff as a nonpoint externality. Am J Agr Econ 64, 547-52. http://dx.doi.org/10.2307/1240648

Hoffman G., 1986. Guidelines for reclamation of salt-affected soil. Appl Agr Res 1(2), 65-72.

MARM, 2008. Análisis de la economía de los sistemas de producción. Resultados técnico-económicos de explotaciones agrícolas de Aragón en 2007. Ministerio de Medio Ambiente y Medio Rural y Marino, Madrid. [In Spanish].

MEMA M., 2006. Las políticas de control de la contaminación difusa en el Valle Medio del Ebro. PhD Dissertation. University of Zaragoza, Zaragoza. [In Spanish].

QUILEZ D., 1998. Salinidad en las aguas superficiales de la cuenca del Ebro: análisis del impacto potencial de regadío de Monegros II. PhD Dissertation. University of Lérida, Lérida. [In Spanish].

Segerson K., 1988. Uncertainty and incentives for nonpoint pollution control. J Environ Manage 15, 87-98. http://dx.doi.org/10.1016/0095-0696(88)90030-7

Shortle J., Dunn J., 1986. The relative efficiency of agricultural source water pollution control policies. Am J Agr Econ 68, 668-667. http://dx.doi.org/10.2307/1241551

Shortle J., Horan R., Abler D., 1998. Research issues in nonpoint pollution control. Environ Resour Econ 11(3-4), 571-585. http://dx.doi.org/10.1023/A:1008276202889

UKU S., 2003. Analisis económico y medioambiental de los sistemas de riego: una aplicación al regadío de Bardenas. PhD Dissertation. University of Zaragoza, Zaragoza. [In Spanish].




DOI: 10.5424/sjar/20110904-498-10