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Policies for the regulation of coexistence between GM and conventional crops AgEcon
Ceddia, M. Graziano; Bartlett, Mark; Perrings, Charles.
Pollen-mediated gene flow is one of the main concerns associated with the introduction of genetically modified (GM) crops, since growers of GM varieties normally do not take into account its possible impact on conventional and organic growers therefore generating negative externalities. Should a premium for non-GM varieties emerge on the market, 'contamination' with GM pollen would generate a revenue loss for growers of non-GM varieties. The existence of such externalities has led the European Union (EU) to put forward the concept of coexistence in order to guarantee farmers' freedom to plant both conventional and GM varieties without generating economic losses to conventional farmers. The first part of this paper develops a simple economic model analysing...
Tipo: Conference Paper or Presentation Palavras-chave: Coexistence; Pollen-mediated gene flow; Monte Carlo simulation; Crop Production/Industries.
Ano: 2008 URL: http://purl.umn.edu/44193
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The economics of biological invasions AgEcon
Perrings, Charles.
Biological invasions are an economic problem. Invasions are typically the intended or unintended consequence of economic activity. They impose real costs on society, and the risk of invasion depends on human behaviour. Effective control of invasions depends on using the right economic instruments and developing the right institutions. The problem has two special features. The first is that the risks of invasions may be very low, but the potential costs are high. Since they are not reflected in market prices, they are typically ignored. The second is that the control of potentially invasive species is a public good of the "weakest link" variety. Both features indicate a precautionary approach. To deal with the first, I recommend the use of environmental...
Tipo: Journal Article Palavras-chave: Resource /Energy Economics and Policy.
Ano: 2001 URL: http://purl.umn.edu/47851
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The Value of Water Rights in Agricultural Properties in the Phoenix Active Management Area AgEcon
Yoo, James; Perrings, Charles; Kinzig, Ann; Abbott, Joshua K.; Simonit, Silvio; Connors, John P.; Maliszewski, Paul J..
This paper estimates the value of water rights in the Phoenix Active Management Area (AMA), Arizona. Within AMAs groundwater rights cannot be transferred separately from the agricultural land to which they apply. As a result there is no separate market for ground water rights. The lack of a market creates two problems: there is no direct signal of the scarcity of water and no mechanism for reallocating water from low-to-high value uses. Water can only be reallocated by changing land use. With the growth of metropolitan Phoenix the value of water committed to residential, commercial or industrial use has increased rapidly relative to the value of water committed to agriculture. This has led to the reallocation of land from agriculture to urban uses. To...
Tipo: Presentation Palavras-chave: Water rights; Hedonic price method; Urbanization; Farmland prices; Elasticity; Marginal willingness to pay; Environmental Economics and Policy; Land Economics/Use.
Ano: 2012 URL: http://purl.umn.edu/124095
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