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Natural resource economics deals with the supply, demand, and allocation of the Earth's natural resources. One main objective of natural resource economics is to better understand the role of natural resources in the economy in order to develop more sustainable methods of managing those resources to ensure their availability to future generations. Resource economists study interactions between economic and natural systems, with the goal of developing a sustainable and efficient economy.〔http://www.uri.edu/cels/enre/ University of Rhode Island Department of Environmental and Natural Resource Economics Retrieved October-22-09〕 ==Areas of discussion== Natural resource economics is a transdisciplinary field of academic research within economics that aims to address the connections and interdependence between human economies and natural ecosystems. Its focus is how to operate an economy within the ecological constraints of earth's natural resources.〔Encyclopedia of Earth. (Article Topic: ecological economics )〕 Resource economics brings together and connects different disciplines within the natural and social sciences connected to broad areas of earth science, human economics, and natural ecosystems.〔(Wordnet Search: Earth science )〕 Economic models must be adapted to accommodate the special features of natural resource inputs. The traditional curriculum of natural resource economics emphasized fisheries models, forestry models, and minerals extraction models (i.e. fish, trees, and ore). In recent years, however, other resources, notably air, water, the global climate, and "environmental resources" in general have become increasingly important to policy-making. Academic and policy interest has now moved beyond simply the optimal commercial exploitation of the standard trio of resources to encompass management for other objectives. For example, natural resources more broadly defined have recreational, as well as commercial values. They may also contribute to overall social welfare levels, by their mere existence. The economics and policy area focuses on the human aspects of environmental problems. Traditional areas of environmental and natural resource economics include welfare theory, land/location use, pollution control, resource extraction, and non-market valuation, and also resource exhaustibility,〔Geoffrey Heal (2008). "exhaustible resources," ''The New Palgrave Dictionary of Economics'', 2nd Edition. (Abstract )〕 sustainability, environmental management, and environmental policy. Research topics could include the environmental impacts of agriculture, transportation and urbanization, land use in poor and industrialized countries, international trade and the environment, climate change, and methodological advances in non-market valuation, to name just a few. Hotelling's rule is a 1931 economic model of non-renewable resource management by Harold Hotelling. It shows that efficient exploitation of a nonrenewable and nonaugmentable resource would, under otherwise stable economic conditions, lead to a depletion of the resource. The rule states that this would lead to a net price or "Hotelling rent" for it that rose annually at a rate equal to the rate of interest, reflecting the increasing scarcity of the resource. Nonaugmentable resources of inorganic materials (i.e. minerals) are uncommon; most resources can be augmented by recycling and by the existence and use of substitutes for the end-use products (see below). Vogely has stated that the development of a mineral resource occurs in five stages: (1) The current operating margin (rate of production) governed by the proportion of the reserve (resource) already depleted. (2) The intensive development margin governed by the trade-off between the rising necessary investment and quicker realization of revenue. (3) The extensive development margin in which extraction is begun of known but previously uneconomic deposits. (4) The exploration margin in which the search for new deposits (resources) is conducted and the cost per unit extracted is highly uncertain with the cost of failure having to be balanced against finding usable resources (deposits) that have marginal costs of extraction no higher than in the first three stages above. (5) The technology margin which interacts with the first four stages. The Gray-Hotelling (exhaustion) theory is a special case, since it covers only Stages 1–3 and not the far more important Stages 4 and 5.〔Vogely, William A. "Nonfuel Minerals and the World Economy", Chapter 15 in "The Global Possible" by Repetto, Robert, World Resources Institute Book Yale University Press〕 Simon has stated that the supply of natural resources is infinite (i.e. perpetual) 〔Simon, Julian. "Can the Supply of Natural Resources Really be Infinite? Yes!", "The Ultimate Resource" 1981, Chapter 3〕 These conflicting views will be substantially reconciled by considering resource-related topics in depth in the next section, or at least minimized. Furthermore, Hartwick's rule provides insight to the sustainability of welfare in an economy that uses non-renewable resources. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Natural resource economics」の詳細全文を読む スポンサード リンク
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