Impacts of Ethanol on Planted Acreage in Market Equilibrium
Land use impacts of biofuel expansion have attracted a tremendous amount of attention because of the implications for the climate, the environment, and the food supply. To examine these impacts, we set up an economic framework that links input use and land allocation decisions with ethanol and agricultural commodity markets. Crops can be substitutes or complements in supply depending on the relative magnitude of three effects of crop prices: total cropland effect, land share effect, and input use effect. We show that with unregulated free markets, total cropland area increases with corn prices whether crops are substitutes or complements in supply. Similarly, higher corn yields from exogenous technical changes lead to cropland expansion. The impacts of yield increases for other crops are ambiguous. With a quantity mandate for ethanol, higher mandates mean larger cropland area if corn and other crops are substitutes in demand. For a given mandate, yield improvement causes total cropland to expand if crop demand is elastic enough, or to contract under a very general condition if crop demand is sufficiently inelastic.
|Date of creation:||31 May 2008|
|Date of revision:|
|Publication status:||Published in American Journal of Agricultural Economics 2010, vol. 92 no. 3, pp. 789-802|
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- Miranowski, John & Orazem, Peter, 1994. "A Dynamic Model of Acreage Allocation with General and Crop-Specific Capital," Staff General Research Papers 10695, Iowa State University, Department of Economics.
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- David A. Hennessy, 2006.
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American Journal of Agricultural Economics,
Agricultural and Applied Economics Association, vol. 88(4), pages 900-914.
- Hennessy, David A., 2004. "On Monoculture and the Structure of Crop Rotations," Staff General Research Papers 12004, Iowa State University, Department of Economics.
- David A. Hennessy, 2004. "On Monoculture and the Structure of Crop Rotations," Center for Agricultural and Rural Development (CARD) Publications 04-wp369, Center for Agricultural and Rural Development (CARD) at Iowa State University.
- Feng, Hongli & Rubin, Ofir D. & Babcock, Bruce A., 2008. "Greenhouse Gas Impacts of Ethanol from Iowa Corn," Lifecycle Carbon Footprint of Biofuels Workshop, January 29, 2008, Miami Beach, Florida 49101, Farm Foundation.
- Searchinger, Timothy & Heimlich, Ralph & Houghton, R. A. & Dong, Fengxia & Elobeid, Amani & Fabiosa, Jacinto F. & Tokgoz, Simla & Hayes, Dermot J. & Yu, Hun-Hsiang, 2008. "Use of U.S. Croplands for Biofuels Increases Greenhouse Gases Through Emissions from Land-Use Change," Staff General Research Papers 12881, Iowa State University, Department of Economics.
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