Revistes Catalanes amb Accés Obert (RACO)

Explorando el costo-efectividad de instrumentos basados en el mercado para la mejora de la calidad del agua : una modelación espacial económico-ambiental

Peter C. Roebeling, Martijn E. van Grieken


Agricultural land use in coastal catchments is shown to lead to (diffuse source) water pollution and subsequent resource degradation in the downstream coastal and marine environment. To ensure sustainable economic development of coastal regions, we need to balance marginal benefits from terrestrial (agricultural) water pollution and associated marginal costs from coastal and marine resource degradation. Water pollution from coastal catchments is, however, considered an externality and, consequently, market-based instruments can be used to internalize this externality such that market behavior could lead to social welfare maximizing outcomes. We employ a spatial environmental-economic modeling approach that integrates a land use model with a hydrological model, to assess the cost-effectiveness of various marketbased instruments in promoting industry adoption of management practices for water quality improvement. Based on abatement costs alone, results from our case-study catchment show that emission based taxes and subsidies are costefficient and more cost-effective than emission proxy taxes and input taxes, while input taxes are more than twice as costeffective as emission proxy taxes.

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