Modelling the marginal revenue of water in selected agricultural commodities: A panel data approach
South Africa is a water-stressed country where water availability is an important constraint to economic and social development, and will become even more so in the future if this scarce resource is not managed effectively. In order to manage this scarce supply of water, we need to value it. This study focuses on the value of water in the agricultural sector, in particular the marginal revenue of water for six irrigation commodities namely avocados, bananas, grapefruit, mangoes, oranges and sugarcane. A quadratic production function was fitted with an SUR model specification in a panel data study from 1975 to 2002 to obtain marginal revenue functions for each of the six commodities. We found that mangoes are the most efficient commodity in its water use relative to revenue generated (marginal revenue of water equals R25.43/mÂ³ in 2002) and sugarcane the least efficient (marginal revenue of water equals R1.67/mÂ³ in 2002). The marginal revenue of water is not an indication of the true Â“marketÂ” price. Neither is it an indication what the administered price should be. The marginal revenue of water is rather a guideline for policy makers to determine which industries or commodities within an industry can generate the largest revenue per unit water applied
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- Grimble, R. J., 1999. "Economic instruments for improving water use efficiency: theory and practice," Agricultural Water Management, Elsevier, vol. 40(1), pages 77-82, March.
- Michael R. Moore, 1999. "Estimating Irrigators' Ability to Pay for Reclamation Water," Land Economics, University of Wisconsin Press, vol. 75(4), pages 562-578.
- Huffman, Wallace E., 1988. "An Econometric Methodology for Multiple-Output Agricultural Technology: An Application of Endogenous Switching Models," Staff General Research Papers 11003, Iowa State University, Department of Economics.
- Michael R. Moore & Ariel Dinar, 1995. "Water and Land as Quantity-Rationed Inputs in California Agriculture: Empirical Tests and Water Policy Implications," Land Economics, University of Wisconsin Press, vol. 71(4), pages 445-461.
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