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	Provedor de dados AgEcon (32) ArchiMer (1) Autor Niemi, Jarkko K. (5) Lehtonen, Heikki (4) Pietola, Kyosti (4) Jones, Randall E. (3) Myyra, Sami (3) Traeger, Christian P. (3) Bond, Craig A. (2) Cacho, Oscar J. (2) Hirschauer, Norbert (2) Knapp, Keith C. (2) Lemoine, Derek M. (2) Lyytikainen, Tapani (2) Morgan, Colin A. (2) Musshoff, Oliver (2) Stott, Alistair W. (2) Vosough Ahmadi, Bouda (2) Aluwihare, Parakrama B. (1) Backus, Ge B.C. (1) Baerenklau, Kenneth A. (1) Brinch, Brian M. (1) Mais... Palavra-chave Dynamic programming (33) Risk and Uncertainty (8) Livestock Production/Industries (7) Resource /Energy Economics and Policy (6) Uncertainty (6) Environmental Economics and Policy (5) Agricultural Finance (4) Crop Production/Industries (4) Farm Management (4) Land Economics/Use (4) Q54 (4) Agricultural and Food Policy (3) Climate change (3) D90 (3) Integrated assessment (3) Investment (3) Livestock epidemics (3) Adaptive control (2) Adaptive management (2) Agriculture (2) Mais... Tipo do documento Conference Paper or Presentation (15) Journal Article (7) Working or Discussion Paper (7) Report (2) Text (1) Working Paper (1) Mais... Ano 2020 (1) 2011 (5) 2010 (3) 2009 (4) 2008 (7) 2007 (2) 2006 (3) 2005 (1) 2004 (2) 2002 (1) 2001 (1) 2000 (1) 1994 (2) Mais... País United States (32) France (1) Idioma Inglês (32) Alemão (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 33 Primeira ... 1 2 ... Última An Incentive System for Salmonella Control in the Pork Supply Chain AgEcon Backus, Ge B.C.; King, Robert P.. This paper presents a dynamic principal-agent analysis of an incentive system for Salmonella control in the pork supply chain. The incentive system determines quality premiums to the producer, testing frequencies for hogs delivered, as well as charges to the producer for testing and penalties. Using cost estimates and technical parameters, we evaluate the cost effectiveness of plant and farm control measures and trade-offs between prevalence reduction and related costs and gains. We also assess the impact of ownership structure on incentive system parameters and performance for a wide range of prevalence threshold levels. Differences in control actions, bacteriological prevalence and the overall welfare gain for the chain are very small across ownership... Tipo: Conference Paper or Presentation Palavras-chave: Dynamic programming; Food quality; Principal-agent; Food Consumption/Nutrition/Food Safety; Livestock Production/Industries. Ano: 2007 URL: http://purl.umn.edu/9941 An Economic Analysis of Water Infrastructure Investments, Agricultural Productivity and Climate Change in the Mekong Delta: Adapting to Increased Salinity and Sea Level Rise AgEcon Corderi Novoa, David; Williams, Jeffrey C.; Howitt, Richard E.; Lund, Jay R.. Replaced with revised version of paper 07/24/11. Tipo: Conference Paper or Presentation Palavras-chave: Climate change; Adaptation; Agriculture; Water resources; Dynamic programming; Crop Production/Industries; Environmental Economics and Policy; International Development; Production Economics; Risk and Uncertainty; Q54; Q25; Q15. Ano: 2011 URL: http://purl.umn.edu/103875 Dynamics of Phosphorus Fertilization and Liming Under Land Tenure Insecurity AgEcon Myyra, Sami; Pietola, Kyosti. This article solves and characterizes optimal decision rules to invest in irreversible land improvements conditional on land tenure insecurity. Economic model is a normative dynamic programming model with known parameter for the one period returns and transition equations. The decision rules are solved numerically conditional on alternative scenarios on the likelihood that the lease contract and, thus, farmer access to land is either renewed or expires. The model parameters represent Finnish soil quality and production conditions. The results suggest that irreversible land improvements decrease quickly and the yields decline gradually when the farmer is confronted with land tenure insecurity caused by uncertain renewal of the lease contract. Tipo: Conference Paper or Presentation Palavras-chave: Agriculture; Dynamic programming; Land Economics/Use; Q15; Q21. Ano: 2005 URL: http://purl.umn.edu/24633 Bioeconomic meta-modelling of Indonesian agroforests as carbon sinks AgEcon Wise, Russell M.; Cacho, Oscar J.. In many areas of developing countries, economic and institutional factors often combine to give farmers incentives to clear forests and repeatedly plant food crops without sufficiently replenishing the soils. These activities lead to large-scale land degradation and contribute to global warming through the release of greenhouse gases into the atmosphere. We investigate whether agroforestry systems might alleviate these trends when carbon-credit payments are available under the Clean Development Mechanism of the Kyoto Protocol. A meta-modelling framework is adopted, comprising an econometric-production model of a smallholding in Sumatra. The model is used within a dynamic-programming algorithm to determine optimal combinations of tree/crop area,... Tipo: Conference Paper or Presentation Palavras-chave: Bio-economic meta-modelling; Indonesia; Agroforestry; Carbon credits; Dynamic programming; Environmental Economics and Policy; Resource /Energy Economics and Policy. Ano: 2008 URL: http://purl.umn.edu/6772 Sustainability, Externalities and Economics: The Case of Temperate Perennial Grazing Systems in NSW AgEcon Jones, Randall E.; Dowling, Peter. The replacement of perennial grass species by undesirable annual grass weeds not only results in lower productivity but is also contributes to a range of external costs. In particular, shallow rooted annuals result in greater deep drainage and therefore a greater potential for salinity, and greater volumes of runoff of poor quality water to streams. In this paper an economic framework for examining the sustainability issues of a perennial grazing system on the NSW Central Tablelands is presented. This involves a combination of simulation and dynamic programming models, with the state of the system represented by variables for the perennial grass composition and soil fertility. The paper examines a range of management strategies that increase the perennial... Tipo: Report Palavras-chave: Perennial pasture; Sustainability; Externalities; Bioeconomic modelling; Dynamic programming; Research and Development/Tech Change/Emerging Technologies; 160. Ano: 2004 URL: http://purl.umn.edu/42504 Ground Water Quantity and Quality Management: Agricultural Production and Aquifer Salinization over Long Time Scales AgEcon Knapp, Keith C.; Baerenklau, Kenneth A.. An economic model of ground water salinization is developed. Starting from a full, high-quality aquifer, there is an initial extraction period, an intermediate waste disposal period, and a final drainage period. Drainage management is initially source control and reuse, but eventually culminates in evaporation basins and a system steady-state. This process occurs over long time scales but is consistent with historical observation. Efficiency is qualitatively similar to common property though quantitative magnitudes differ substantially. Regulatory pricing instruments are developed to support the efficient allocation. The system is not sustainable in that net returns generally decline through time until the steady-state. Tipo: Journal Article Palavras-chave: Common property; Dynamic programming; Efficiency; Ground water; Irrigation; Salinity; Sustainability; Resource /Energy Economics and Policy. Ano: 2006 URL: http://purl.umn.edu/8633 Market implications of FMD epidemics in the Finnish pig sector: Does market structure matter? AgEcon Niemi, Jarkko K.; Lehtonen, Heikki; Lyytikainen, Tapani; Kallio, E.. This paper examines the role of market coordination and market distortions caused by a hypothetical FMD outbreak in the Finnish pig sector. By using stochastic dynamic programming, it simulates the consequences of two outbreak scenarios (large vs. small) under two distinct market regimes (competitive market vs. monopoly in the domestic supply). Simulated losses depend on the magnitude of outbreak and expected duration of possible turndown of meat exports, whereas market regime has a limited impact. Tipo: Conference Paper or Presentation Palavras-chave: Foreign trade; Livestock epidemics; Dynamic programming; Livestock Production/Industries. Ano: 2008 URL: http://purl.umn.edu/43837 Economic cost of environmental flows in an unregulated river system AgEcon Jones, Randall E.; Crean, Jason; Aluwihare, Parakrama B.; Letcher, Rebecca A.. This paper applies a stochastic dynamic programming framework, incorporating links to hydrological and biophysical models, to assess the economic costs of environmental flows in an unregulated river system in the Namoi Valley of northern New South Wales, Australia. Structural adjustment decisions are included in the model to account for farmer responses to changes in environmental flows through the introduction of a water sharing plan. The results of the analysis indicate that the proposed level of environmental flows reduces water extractions by around 6 per cent, and imposes an opportunity cost of less than 1 per cent in terms of reduced net income over a 20-year period. Tipo: Journal Article Palavras-chave: Dynamic programming; Environmental flows; Irrigation; Resource /Energy Economics and Policy. Ano: 2007 URL: http://purl.umn.edu/118334 WATER MANAGEMENT IN BANGLADESH AGRICULTURE: OPTIMAL USE AND INVESTMENT POLICIES FOR ADAPTATION TO CLIMATE CHANGE AgEcon Khan, Mohammad Ismail. In Bangladesh, climatic change is likely to impact significantly upon surface and groundwater availability, as well as in other countries. The population of Bangladesh is projected to be double the current 2010 level by 2050. Demand for water will rise with the increasing demand for rice. This paper considers the optimal demand management of irrigation water with stochastic supply under climate change for a 3-year planning horizon. It also identifies the utilization of irrigation water from surface water sources to maximize the expected net social return from rice production. This is done by considering decision on dam release for rice production with reference to climate change. A stochastic dynamic programming model is developed for analyzing the levels... Tipo: Conference Paper or Presentation Palavras-chave: Climate change; Dam release; Dynamic programming; Environmental Economics and Policy. Ano: 2011 URL: http://purl.umn.edu/100571 Dynamically Optimal Phosphorus Management and Agricultural Water Protection AgEcon Iho, Antti; Laukkanen, Marita. This paper puts forward a model of the role of phosphorus in crop production, soil phosphorus dynamics and phosphorus loading that integrates the salient economic and ecological features of agricultural phosphorus management. The model accounts for the links between phosphorus fertilization, crop yield, accumulation of soil phosphorus reserves, and phosphorus loading. It can be used to guide precision phosphorus management and erosion control as means to mitigate agricultural loading. Using a parameterization for cereal production in southern Finland, the model is solved numerically to analyze the intertemporally optimal combination of fertilization and erosion control and the associated soil phosphorus development. The optimal fertilizer application rate... Tipo: Working or Discussion Paper Palavras-chave: Precision nutrient management; Agricultural phosphorus loading; Cereal production; Soil phosphorus reserves; Agricultural water pollution; Dynamic programming; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy. Ano: 2009 URL: http://purl.umn.edu/54285 Farmers' Exit Decisions and Early Retirement Programs in Finland AgEcon Pietola, Kyosti; Vare, Minna; Oude Lansink, Alfons G.J.M.. This paper estimates farmer decisions between three discrete occupational choices: exit and close down the farming operation (1), exit and transfer the farm to a new entrant (2), or continue farming and retain the option to exit later on (3). The farmer optimisation problem is formulated as a recursive optimal stopping problem. The unknown parameters are first estimated by a switching-type, reduced form Probit models and, then by the Simulated maximum likelihood (SML) method, controlling for serial correlation in the errors. Serial correlation in the errors is controlled for by the Geweke-Hajivassiliou-Keane (GHK) simulation technique. The results suggest that the timing and the type of farmer exit decisions respond elastically to farmer characteristics,... Tipo: Conference Paper or Presentation Palavras-chave: Exit; Entry; Dynamic programming; Switching-type Probit; Simulated Maximum Likelihood; Labor and Human Capital. Ano: 2002 URL: http://purl.umn.edu/24825 Trade-offs between conflicting animal welfare concerns and cow replacement strategy in out-wintering Scottish suckler herds AgEcon Vosough Ahmadi, Bouda; Morgan, Colin A.; Stott, Alistair W.. Since decoupling of the CAP, many Scottish suckler cow farms are facing financial difficulties. In response, many farmers are out-wintering extensively managed suckler cows to minimise production costs. These systems are of animal welfare concern. A range of trade-offs between animal welfare indicators and between animal welfare and farm profitability can be identified. A Dynamic Programming (DP) model was developed to study these trade-offs. Two herds were modelled assuming their feeding regimes were either low (LHERD) or high (HHERD). The objective of the DP was to maximise the expected net margin from a current cow and its successors over an infinite time horizon. Preliminary results showed that the rate of voluntary culling was higher in HHERD than in... Tipo: Conference Paper or Presentation Palavras-chave: Beef cow; Economics; Dynamic programming; Animal welfare; Livestock Production/Industries. Ano: 2009 URL: http://purl.umn.edu/51078 Risk Classification in Animal Disease Prevention: Who Benefits from Differentiated Policy? AgEcon Niemi, Jarkko K.; Lyytikainen, Tapani; Sahlstrom, Leena; Virtanen, Terhi; Lehtonen, Heikki. Risk classification of livestock farms can help stakeholders design and implement risk management measures according to the possessed risk. Our goal is to examine how differently pig farms may contribute to the societal costs of an animal disease outbreak, how valuable this information is to different stakeholders, and how it can be used to target risk management measures. We show that the costs of an outbreak starting from a certain farm can be quantified for the entire sector using bio-economic models. In further studies, this quantified risk can be differentiated so that farms and slaughterhouses internalise the full cost of risk in production decisions and inhibit animal densities, animal contact structures or other characteristics which pose a threat... Tipo: Conference Paper or Presentation Palavras-chave: Risk classification; Animal disease; Simulation; Dynamic programming; Partial-equilibrium; Losses; Agricultural and Food Policy; Agricultural Finance; Livestock Production/Industries; Risk and Uncertainty. Ano: 2009 URL: http://purl.umn.edu/49307 Registros recuperados: 33 Primeira ... 1 2 ... Última

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