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Precificação Da Água Em Projetos De Irrigação: Uma Aplicação Do Método Paramétrico De Estimação De Uma Função Insumo-Distância

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  • Resende Filho, Moises de Andrade
  • Araujo, Felipe Augusto De
  • Barros, Emanoel De Souza
  • Silva, Alexandre Stamford Da

Abstract

O aumento da pressão sobre os recursos hídricos tem levado muitos países a reconsiderarem os mecanismos utilizados na indução do uso eficiente da água. Isso é especialmente verdade para a agricultura irrigada, uma das principais consumidoras de água. Estabelecer o preço correto da água é um dos mecanismos de tornar mais eficiente a alocação da água. Contudo, precificar a água ainda é uma tarefa polêmica. Assim, o presente estudo aplica o método paramétrico de estimação de uma função insumo-distância na obtenção do preço-sombra ou disposição da firma a pagar por uma unidade adicional de água. São utilizados dados sobre a produção, área irrigada, utilização de insumos diversos, mão-de-obra, capital e volume de água obtidos de 41 unidades produtivas localizadas nos projetos de irrigação pública localizados no Submédio São Francisco. Apresenta-se as estimativas dos preços-sombra e argumenta-se que o preço-sombra da água serviria como um proxy do preço a ser cobrado por metro cúbico de água em caso de expansão da oferta de água. Os resultados obtidos se mostraram coerentes quando comparados aos preços de mercado, o que sugere o potencial em se utilizar o método no processo de precificação da água para irrigação.--------------------------------------------------------Countrie s have reconsidered various mechanisms to improve water use efficiency as a consequence of increasing economic pressures on water resources. This is especially true for irrigated agriculture that is a major consumer of water worldwide. Getting prices right is one way to allocate water, but how to accomplish this is still a polemic issue. Assuming producers implicitly face a water constraint, we estimate a Translog input-distance function to obtain water shadow-prices. The water shadow-price is viewed as the value a producer would be willing to pay so to obtain an additional unit of water. We use data regarding total production value, irrigated area, labor, capital, water and other inputs taken from 41 producers located in the sub medium São Francisco River, Brazil. We present water shadow-price estimates and argue that these values can be used as a proxy for the price by which each individual producer might be charged in case of an expansion in the water supply. In general, we found input shadow-price estimates coherent with their market prices. Therefore, it seems that the estimation of input shadow prices via a Translog input-distance function approach has potential to be used as an additional tool to support water pricing.

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Bibliographic Info

Paper provided by Sociedade Brasileira de Economia, Administracao e Sociologia Rural (SOBER) in its series 46th Congress, July 20-23, 2008, Rio Branco, Acre, Brasil with number 112738.

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Date of creation: Jul 2008
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Handle: RePEc:ags:sbrfsr:112738

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Web page: http://www.sober.org.br/
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Keywords: Disposição a pagar pela água; precificação da água; programação linear; Willingness to pay for water; water pricing; linear programming; Crop Production/Industries; Resource /Energy Economics and Policy;

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