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Registros recuperados: 23
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Adjustment under different trade strategies: a mean-variance analysis with a CGE model of the Yugoslav economy AgEcon
Adelman, Irma; Berck, Peter; Labus, Miroljub; Vujovic, Dusan.
Tipo: Working or Discussion Paper Palavras-chave: Commerce; Economics; Equilibrium; Sam.
Ano: 1990 URL: http://purl.umn.edu/43667
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Agrarökonomik zur Jahrhundertwende – Bewährtes und Unorthodoxes AgEcon
Brandes, Wilhelm.
In this farewell lecture some concepts important for (agricultural) economics are discussed. Special emphasis is given to the Invisible Hand of Adam Smith, sunk costs, information economics, path dependency, error tolerance and redundancy. It is proposed that agricultural economists follow closely new developments in economics proper.
Tipo: Journal Article Palavras-chave: Equilibrium; Sunk costs; Game theory; Opportunism; Rationality; Path dependency; Error tolerance; Social rate of discount; Agricultural and Food Policy; Teaching/Communication/Extension/Profession.
Ano: 2001 URL: http://purl.umn.edu/99010
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AN EQUILIBRIUM ANALYSIS OF THE IMPACT OF ANTIBIOTICS BANS ON INVESTMENT IN APPLE ORCHARDS AgEcon
Hennessy, David A.; Roosen, Jutta.
The decision to replant a fire blight-susceptible apple orchard is analyzed. Embedding the problem into an equilibrium framework facilitates the welfare analysis of changes in orchard survival probabilities arising from a ban on antibiotics use. We estimate the structural impacts and welfare changes of the ban.
Tipo: Conference Paper or Presentation Palavras-chave: Antibiotics; Apple orchard; Dynamics; Equilibrium; Replanting; Resistance; Truncated Poisson process; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies.
Ano: 1999 URL: http://purl.umn.edu/21698
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Biosorption of lead(II) and chromium(VI) on groundnut hull: Equilibrium, kinetics and thermodynamics study Electron. J. Biotechnol.
Qaiser,Suleman; Saleemi,Anwar R; Umar,Muhammad.
The biosorption of lead(II) and chromium(VI) on groundnut hull was investigated. Batch biosorption experiments were conducted to find the equilibrium time and biosorption capacity. Effect of parameters like pH, temperature and initial metal concentration was studied. The maximum biosorption capacity of lead(II) and chromium(VI) was found to be 31.54 ± 0.63 and 30.21 ± 0.74 mg g-1, respectively. The optimum pH for lead(II) and chromium(VI) removal was 5 ± 0.1 and 2 ± 0.1, respectively. The temperature change, in the range of 20 - 45ºC affected the biosorption capacity. The maximum removal of lead(II) was achieved at 20 ± 2ºC, where as maximum uptake of chromium(VI) was observed at 40 ± 2ºC. The biosorption data was fitted to the Langmuir and the Freundlich...
Tipo: Journal article Palavras-chave: Biosorption; Equilibrium; Groundnut hull; Kinetics; Thermodynamics.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400003
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Biosorption of uranium from aqueous solutions by nonliving biomass of marinealgae Cystoseira indica Electron. J. Biotechnol.
Hassan Khani,Mohammad; Reza Keshtkar,Ali; Meysami,Behrouz; Firouz Zarea,Mohammad; Jalali,Reza.
Biosorption of heavy metals can be an effective process for the removal and recovery of heavy metal ions from aqueous solutions. In this paper uranium biosorption by protonated, Ca-pretreated and non-pretreated Cystoseira indica algae biomass was investigated in a batch system. The results of the kinetic studies showed that the sorption of uranium on protonated and non-pretreated biomass followed pseudo-second order kinetics. The effect of pH on the equilibrium uranium sorption capacity of Cystoseira indica exhibited that highest uptake occurred at pH 4 at a solution with 350 mg/l uranium concentration. At various initial uranium concentrations from 50 to 1000 mg/l, batch sorption equilibrium at 30ºC was reached within 3 hrs and the sorption...
Tipo: Journal article Palavras-chave: Biosorption; Cystoseira indica; Equilibrium; Kinetic; Marine algae; Uranium.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200003
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Can market power be estimated? AgEcon
Hyde, Charles Evan; Perloff, Jeffrey M..
Tipo: Working or Discussion Paper Palavras-chave: Economics; Equilibrium; Marketing; Supply and demand; Marketing.
Ano: 1993 URL: http://purl.umn.edu/47275
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Competition, Kinship or Reciprocity? Village Experiments in Alternative Modes of Exchange AgEcon
Subramanian, Arjunan; Qaim, Matin.
In this paper, detailed data on transactions in a village commodity market are used to explain the puzzle of sluggish agricultural supply response. We show that existence of reciprocity among sellers exhibits multiple equilibria and creates trade diversion. Large volumes of the commodity are sold to a trader who does not offer the best price, but on whom sellers depend through transactions in other markets. An implication of this trader-idiosyncratic effect on supply is that policies that affect prices may result in different supply responses.
Tipo: Conference Paper or Presentation Palavras-chave: Reciprocity; Kinship; Neighborhood effects; Trader idiosyncrasy; Equilibrium; Consumer/Household Economics.
Ano: 2006 URL: http://purl.umn.edu/25434
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Curvas de dessorção e calor latente de vaporização para as sementes de milho pipoca (Zea mays). Repositório Alice
CORREA, P.C.; MARTINS, J.H.; CHRIST, D.; MANTOVANI, B.H.M..
O objetivo deste trabalho foi determinar as curvas de umidade de equilibrio higroscopico e o calor latente de vaporizacao para as sementes de milho pipoca (Zea mays). O teor de umidade inicial das sementes era 23% b.u. As sementes foram submetidas e dessorcao, sob diversas condicoes de temperatura (20, 30, 40 e 50oC) e umidade relativa do ar (30, 40, 50, 60, 70, 80 e 90%) com tres repeticoes, ate atingirem a umidade de equilibrio. A temperatura e a umidade relativa do ar foram controladas por meio de uma unidade condicionadora de ar "Aminco-Air". Os seguintes modelos matematicos foram ajustados aos dados experimentais. Henderson, Henderson modificado, Chang-Pfost, Copace e Sigma-Copace; as constantes dessas equacoes foram por regressao, enquanto o calor...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Milho pipoca; Equilibrio higroscopico; Calor latente; Vaporizacao; Zea mays; Popcorn; Equilibrium; Moisture content; Latent heat; Vaporization.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/480341
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Ecological-economic modelling for the sustainable management of biodiversity ArchiMer
Doyen, Luc; Cisse, Abdoul; Gourguet, Sophie; Mouysset, L.; Hardy, Pierre-yves; Bene, Christophe; Blanchard, Fabian; Jiguet, Frederic; Pereau, J.-c.; Thebaud, Olivier.
Terrestrial and marine biodiversity provides the basis for both ecosystems functioning and numerous commodities or services that underpin human well-being. From several decades, alarming trends have been reported worldwide for both biodiversity and ecosystem services. Therefore the sustainable management of biodiversity requires a double viewpoint balancing ecological conservation with the welfare of human societies. Understanding the underlying trade-offs, synergies and interactions imposes the development of interdisciplinary researches and methods. In that respect, bio-economic or ecological economic modeling is likely to play a major role. The present paper intends to elicit the key features, strengths and challenges of bio-economic approaches...
Tipo: Text Palavras-chave: Ecological economics; Modeling; Sustainability; Biodiversity; Public policy; Criterion; Equilibrium; Optimality; Viability.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00171/28208/26510.pdf
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Effects of biosorption parameter: kinetics, isotherm and thermodynamics for Ni(II) biosorption from aqueous solution by Circinella sp. Electron. J. Biotechnol.
Alpat,Senol; Alpat,Sibel Kilinç; Çadirci,Bilge Hilal; Özbayrak,Özge; Yasa,Ihsan.
Circinella sp. was employed as a biosorbent for removal of Ni(II) from aqueous solution. The biosorption kinetics and isotherms were investigated. The effect of several parameters, such as biosorbent dosage, contact time, initial concentration, pH and temperature, on biosorption process was evaluated. The kinetic studies indicated that the biosorption followed pseudo-second order kinetic model. Biosorption behaviour of Ni(II) on Circinella sp. was expressed by both Langmuir and Freundlich isotherms. The equilibrium data fit better to the Langmuir model compared to the Freundlich model in concentration range studied (1.0-3.0 mM). The thermodynamic parameters (ΔG0, ΔH0 and ΔS0) were also determined, and it was found that the Ni(II)...
Tipo: Journal article Palavras-chave: Biosorption; Circinella sp; Equilibrium; Kinetic; Nickel.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500004
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Equilibrium of Land Values from Agricultural and General Economic Factors for Cropland and Pasture Capitalization in Georgia AgEcon
Flanders, Archie; White, Fred C.; Escalante, Cesar L..
Nonagricultural factors impact land values to cause a divergence of discounted cash rents for agricultural land and land values in Georgia. General economic factors are represented by per capita income in nonmetro areas. Cash rents for cropland and pasture have positive impacts on land values. Nonagricultural factors are stronger influences on land values than are cash rents. Greater effective demand exists for pasture than for cropland because pasture is subject to relatively more pricing pressure in northern counties with higher incomes and population. Increased land values have led to increased net wealth for Georgia agricultural producers.
Tipo: Journal Article Palavras-chave: Capitalization; Cash rent; Cointegration; Equilibrium; Error correction mechanism; Land values; Land Economics/Use.
Ano: 2004 URL: http://purl.umn.edu/59605
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Firm-specific information, product differentiation, and industry equilibrium AgEcon
Perloff, Jeffrey M.; Salop, Steven.
Where consumers have imperfect information about specific firms’ prices and lack information about the market, firms have informational market power. In general, improving the consumer’s information about each firm’s price will not necessarily lower average market price. We show, however, that certain types of improvements will lower price. Moreover, a reduction in barriers to entry (e.g., capital costs) will lower price-holding information constant. Where a significant number (but not all) consumers have perfect information, single-price equilibria are impossible.
Tipo: Working or Discussion Paper Palavras-chave: Competition; Consumers; Consumers' preferences; Consumer education; Mathematical models; Demand elasticity; Economics; Equilibrium; Marketing; Consumer/Household Economics; Demand and Price Analysis.
Ano: 1985 URL: http://purl.umn.edu/47003
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Hedging with a housing starts futures contract AgEcon
Berck, Peter; Rosen, Kenneth T..
Tipo: Working or Discussion Paper Palavras-chave: Economics; Equilibrium; Future trading.
Ano: 1984 URL: http://purl.umn.edu/43307
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Limited Food Access as an Equilibrium Outcome: An Empirical Analysis AgEcon
Bonanno, Alessandro; Chenarides, Lauren; Goetz, Stephan J..
Lack of access to nutritious and affordable food has become an important public policy issue in the U.S.: various interest groups are seeking to reverse a trend whereby certain areas lack larger, full-service grocery stores that provide “higher” quality foods. Based on game-theoretic findings suggesting that lack of food access can be an equilibrium outcome, we specify a model relating access to higher quality food stores to a vector of supply and demand factors, using seven years of county-level data for the contiguous U.S., and a constrained generalized ordered logit estimator. Our results suggest that demand side factors, especially market size (total income and SNAP funds) play an important role in determining food access, and that large food stores...
Tipo: Presentation Palavras-chave: Food Access; Equilibrium; Food-Store Density; Food Consumption/Nutrition/Food Safety; Q18; R3; L81.
Ano: 2012 URL: http://purl.umn.edu/123196
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Price Relationships in the U.S. Tree Nut Market AgEcon
Ibrahim, Mohammed; Florkowski, Wojciech J..
Although most U.S. tree nuts have very specific and different uses, some substitutability does occur, complicating the price analysis in the tree nut market. We examine the relationships among U.S. tree nut prices using the Johansen’s cointegration procedure. We found long run equilibrium among some nut prices, namely, pecans, walnuts, and almonds. These findings are consistent with recent suggestions that cointegration exist among substitutes.
Tipo: Conference Paper or Presentation Palavras-chave: Substitutability; Cointegration; Tree nuts; Long-run; Equilibrium; Demand and Price Analysis; Marketing.
Ano: 2007 URL: http://purl.umn.edu/9898
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Rainfall or Price Variability: What Determines Rangeland Management Decisions? A Simulation-Optimization Approach to South African Savannas AgEcon
Börner, Jan; Higgins, Steven Ian; Kantelhardt, Jochen; Scheiter, Simon.
Savannas cover the greater part of Africa and Australia and almost half of South America and contribute to the livelihoods of more than 350 million people. With the intensification of land use during the second half of the 20th century, savannas have become increasingly degraded through bush encroachment as a consequence of increased grazing pressure. Research on rangeland dynamics, however, provides contradicting answers with regard to the causes and possible remedies of bush encroachment. In this paper we present results from an application of a simulation-optimization model to the case of extensive rangeland management in South Africa. Our model differs from previous approaches in that it explicitly accounts for the influence of stochastic prices and...
Tipo: Conference Paper or Presentation Palavras-chave: Equilibrium; Bio-economic modeling; Grassland management; Sustainable strategies; Stochastic conditions; Livestock Production/Industries; Q57.
Ano: 2006 URL: http://purl.umn.edu/25435
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Relationship of the Interests between the Dairy Farmer and the Company in Ecological Agriculture -A Case of the Dairy Industry in Sichuan Province, China AgEcon
Chen, Jia-Wei; Qi, Yan-bin.
Development status of dairy industry in Sichuan Province, China is analyzed, indicating that how to ensure the high-quality and ecological production of peasant households has become an important issue for the safety and healthy of the masses and the development of dairy industry. Game model is established and the solution for the model is obtained. Based on analyzing the relationship of the interests between the dairy farmer and the company in ecological agriculture, two mixed strategies of Nash equilibrium are obtained. One is that when the probability is equal to , there are no differences between purchasing or not purchasing; if the probability of company purchase is equal to , there are no differences between producing high-quality milk and...
Tipo: Journal Article Palavras-chave: Game theory; Equilibrium; High quality milking; Moral risk; China; Agribusiness.
Ano: 2010 URL: http://purl.umn.edu/97625
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Reworking the Standard Model of Competitive Markets: The Role of Fuzzy Logic and Genetic Algorithms in Modelling Complex Non-Linear Economic System AgEcon
Smith, Peter.
Some aspects of economic systems (eg, nonlinearity, qualitative variables) are intractable when incorporated into models. The widespread practice of excluding them (or greatly limiting their role) produces deviations of unknown size and form between the resulting models and the reality they purport to represent. To explore this issue, and the extent to which a change in methodology can improve tractability, a combination of two techniques, fuzzy logic and genetic algorithms, was applied to the problem of how the sellers in a freely competitive market, if initially trading at different prices, can find their way to supply/demand equilibrium. A multi-agent model was used to simulate the evolution of autonomously- learnt rule-governed behaviour, (i), under...
Tipo: Working or Discussion Paper Palavras-chave: Competition; Markets; Walrasian Crier; Equilibrium; Fuzzy logic; Genetic algorithms; Evolutionary algorithms; Industrial Organization.
Ano: 2004 URL: http://purl.umn.edu/30569
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Tariffs and quotas that lower prices and raise welfare AgEcon
Perloff, Jeffrey M..
Tipo: Working or Discussion Paper Palavras-chave: Consumers; Economics; Equilibrium; Import; Quotas; International Relations/Trade; Food Security and Poverty.
Ano: 1993 URL: http://purl.umn.edu/47254
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The effect of tariffs in markets with vertical restraints AgEcon
Fargeix, Andre; Perloff, Jeffrey M..
Tipo: Working or Discussion Paper Palavras-chave: Competition; Economics; Equilibrium; Marketing; Mathematical models; Monopolies; Tariff; Welfare economics; Marketing; International Relations/Trade.
Ano: 1987 URL: http://purl.umn.edu/47040
Registros recuperados: 23
Primeira ... 12 ... Última
 

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