SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Flanders, Archie; White, Fred C.; Shurley, W. Donald; Brown, Steve M..

Genetically modified cotton varieties have the potential for increasing returns and/or decreasing labor requirements. A nonlinear optimization model is applied to a whole farm analysis for evaluating cotton production technologies. This model maximizes farm utility, composed of expected returns and their variability, at various risk aversion levels in order to evaluate cotton production technologies. Results show that while conventional cotton maximizes utility in a risk-neutral situation, transgenic cotton varieties entered into the optimal solutions as higher levels of risk aversion were considered.

Tipo: Journal Article

Palavras-chave: Cotton production technologies; Mathematical optimization; Risk aversion; Whole farm analysis; C61; Q16.

Ano: 2003

URL: http://purl.umn.edu/43204

Welfare distribution between EU Member States through different national decoupling options. Implications for Spain

Dominguez, Ignacio Perez; Wieck, Christine.

SUMMARY: This paper makes use of an agricultural sector model to analyse welfare effects derived from different national implementation options of the CAP Reform 2003. It shows that agricultural prices developed more favourable in a full premium decoupling scenario, since agricultural production declines more pronounced compared to a partial decoupling scenario. The use of the partial decoupling mechanism helps Member States to distribute income into less favoured areas but is not the optimal policy choice. However, if other Member States follow the same path of reform, a "prisoner's dilemma" will most likely be observed: partial decoupling appears as the preferred option for individual Member States, since high domestic production and high producer prices...

Tipo: Journal Article

Palavras-chave: Common Agricultural Policy; Partial equilibrium analysis; Modelling; Decoupling; Welfare analysis.; Agricultural and Food Policy; C61; D60; Q18.

Ano: 2006

URL: http://purl.umn.edu/8005

Managing Water Shortages in the Western Electricity Grids

Scorah, Hugh; Sopinka, Amy; van Kooten, G. Cornelis.

British Columbia’s electricity grid is comprised primarily of hydroelectric generating assets. The ability to store water in reservoirs is a significant advantage for the province allowing it to import from Alberta when prices are favourable. Alberta, has a heavily fossil-fuel based electricity portfolio, but has seen substantial growth in its wind energy capacity. However this variable energy technology impacts the province’s grid operations. Wind energy is both variable and uncertainty. However, wind energy in Alberta can be stored via BC’s reservoir systems. In this paper, we examine the extent that drought impacts the both overall operating costs as well as the cost of reducing CO2 emissions. We model the Alberta and BC interconnected grids varying...

Semi-subsistence Farm Households in Central and South-eastern Europe: Current State and Future Perspectives

Palavras-chave: Wind power; Carbon costs; Electrical grids; Mathematical programming; Resource /Energy Economics and Policy; Q54; Q41; C61.

Ano: 2010

URL: http://purl.umn.edu/59701

Fritzsch, Jana; Wegener, Stefan; Buchenrieder, Gertrud; Curtiss, Jarmila; Gomez y Paloma, Sergio.

The European Union (EU) introduced a special transitional semi-subsistence measure to promote the smallest agricultural producers, so-called semi-subsistence farm households (SFHs) in the enlargement process. An outlook on the future of SFHs requires comprehensive and reliable information on the phenomenon and the impact of policy measures on their development. Therefore, a survey using a standardised questionnaire was conducted in Poland (175 households), Romania (185 households), and Bulgaria (184 households) from July to September 2007. In a first step, four major types of SFHs could be identified by means of cluster analysis: (i) rural diversifiers, (ii) rural pensioners, (iii) farmers, and (iv) rural newcomers. In a second step, a multiobjective...

Optimal intertemporal investment in Australian agriculture: An empirical investigation

Palavras-chave: Semi-subsistence; Policy analysis; Transition countries; Multiobjective linear programming; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Research Methods/ Statistical Methods; C61; P27; Q12.

Ano: 2009

URL: http://purl.umn.edu/51444

Influencia social y sostenibilidad en el uso de recursos renovables

Agbola, Frank W..

This paper empirically investigates optimal intertemporal investment behaviour of farmers in Australia. The dynamic investment model is estimated using pooled crosssectional and time-series farm survey data spanning the period 1979-1993. The model captures intertemporal investment behaviour of farmers, including independent and instantaneous adjustment decisions. Empirical test results indicate that labour, capital, sheep numbers and cattle numbers adjust sluggishly towards their long-run equilibrium levels. Results provide empirical evidence to indicate that adjustment problem is characteristic of production in agricultural zones Australia.

Tipo: Journal Article

Palavras-chave: Australia; Agricultural zones; Optimal intertemporal investment model; Quaxi-fixity; Adjustment costs; Farm Management; Research Methods/ Statistical Methods; C33; C12; C13; C61.

Ano: 2005

URL: http://purl.umn.edu/44094

Almudi, Isabel; Choliz, Julio Sanchez.

En este trabajo presentamos un modelo en el que las actividades extractivas referidas a un recurso natural renovable, si son abusivas, generan algún tipo de reacción social que modifica las preferencias sociales. Esta modificación es tenida en cuenta por el planificador a la hora de decidir cual es la asignación intertemporal óptima entre consumo y stock del recurso. Bajo estas nuevas condiciones, nos preguntamos cómo cambia el stock del recurso natural en el estado estacionario y qué puede decirse acerca de la posibilidad de sobreexplotación en comparación con los modelos tradicionales en los que no se considera reacción social. Los resultados obtenidos muestran que bajo estas nuevas condiciones el stock del estado estacionario aumenta y el comportamiento...

Tipo: Journal Article

Palavras-chave: Renewable Resources; Sustainability; Environmental Information; Overuse; Resource /Energy Economics and Policy; Q50; Q20; C61.

Ano: 2006

URL: http://purl.umn.edu/8003

A Participatory Approach to Assess the Effectiveness of Responses to Cope with Flood Risk

Ceccato, Lucia; Giannini, Valentina; Giupponi, Carlo.

This work illustrates the preliminary findings of a participatory research process aimed at identifying responses for sustainable water management in a climate change perspective, in two river basins in Europe and Asia. The paper describes the methodology implemented through local workshops, aimed at eliciting and evaluating possible responses to flood risk. Participatory workshops allowed for the identification of four categories of possible responses and a set of nine evaluation criteria, three for each of the three pillars of sustainable development. The main outcome of such activities consists in the ranking of broad response categories instrumental to the objective of the Brahmatwinn research project, i.e. the identification of Integrated Water...

Finding Maxmin Allocations in Cooperative and Competitive Fair Division

Palavras-chave: Participatory Process; Climate Change; Flood Risk; Decision Support System; Multi Criteria Analysis; MCA; Eliciting Responses; Evaluating Responses; Integrated Water Resources Management; IWRM; Mulino Decision Support System; MDSS; Environmental Economics and Policy; C61; Q01; Q54; Q56; Q58.

Ano: 2010

URL: http://purl.umn.edu/60662

Dall'Aglio, Marco; Di Luca, Camilla.

We consider upper and lower bounds for maxmin allocations of a completely divisible good in both competitive and cooperative strategic contexts. We then derive a subgradient algorithm to compute the exact value up to any fixed degree of precision.

Tipo: Working Paper

Palavras-chave: Fair Division; Maxmin Allocation; Kalai Bargaining Solution; Cooperative Game Theory; Research Methods/ Statistical Methods; D63; C61; C71; C78.

Ano: 2011

URL: http://purl.umn.edu/120020

Policy Design as an Irreversible Investment Under Uncertainty: Norwegian Agriculture and the WTO

Mittenzwei, Klaus.

This paper is concerned with the timing of an agricultural policy reform under uncertainty. The focus is on the opportunity cost of giving up the option to wait when implementing a policy reform. Including the option value in applied policy analysis can help explain why conventional analyses may find observed policies to be Pareto-inferior. Furthermore, it explains why otherwise profitable policy reforms may be delayed. The theoretical model is applied to Norwegian agricultural policy anticipating a prospective WTO agreement. It is argued that the option value should be incorporated into applied policy analysis when high uncertainty prevails.

Semi-subsistence farm households and the non-farm rural economy - Perspectives and challenges

Palavras-chave: Option value; Policy reform; WTO; Norway; Uncertainty; International Relations/Trade; C61; D78.

Ano: 2002

URL: http://purl.umn.edu/24875

Buchenrieder, Gertrud; Fritzsch, Jana; Wegener, Stefan; Curtiss, Jarmila; Gomez y Paloma, Sergio.

Semi-subsistence farm households (SFHs) have persevered in Central and Southeastern Europe. An outlook on future perspectives of SFHs asks for reliable information on the phenomenon of SFHs and the impact of policy measures on their development options: (1) intensifying farming, (2) diversifying income creating activities, or (3) exiting farming for waged employment. This article focuses on SFHs and rural non-farm employment (RNFE). On the basis of a comparative 2007-survey of 489 SFHs in Bulgaria, Poland and Romania, three countries with particularly many SFHs, four major types of SFHs (rural pensioners, farmers, rural diversifiers, rural newcomers) were identified. For policy analysis, a multiobjective linear programming household model was developed. In...

Bioeconomic modeling of wetlands and waterfowl in Western Canada: Accounting for amenity values

Palavras-chave: Semi-subsistence; Rural non-farm economy; Policy analysis; Transition countries; Agribusiness; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Land Economics/Use; Political Economy; C61; P27; Q12.

Ano: 2009

URL: http://purl.umn.edu/52804

van Kooten, G. Cornelis; Withey, Patrick; Wong, Linda.

This study extends an original bioeconomic model of optimal duck harvest and wetland retention by bringing in amenity values related to the nonmarket (in situ) benefits of waterfowl plsi the ecosystem values of wetlands themselves. The model maximizes benefits to hunters as well as the amenity values of ducks and ecosystem benefits of wetlands, subject to the population dynamics. Results indicate that wetlands and duck harvests need to be increased relative to historical levels. Further, the socially optimal ratio of duck harvest to wetlands is larger than what has been observed historically. Including amenity values leads to a significant increase in the quantity of wetlands and duck harvests relative to models that focus only on hunting values.

Pollution Control with Uncertain Stock Dynamics: When, and How, to be Precautious

Palavras-chave: Bioeconomic modelling; Wetland protection; Wildlife management; Nonmarket values; Prairie pothole region; Environmental Economics and Policy; Q57; C61; Q25.

Ano: 2010

URL: http://purl.umn.edu/61308

Athanassoglou, Stergios; Xepapadeas, Anastasios.

Replaced with revised version of paper 10/05/11.

Analisis de escenarios de políticas para la gestion publica en la agricultura de regadio

Palavras-chave: Risk; Ambiguity; Robust Control; Precautionary Principle; Pollution Control; Environmental Economics and Policy; C61; D80; D81.

Ano: 2011

URL: http://purl.umn.edu/101296

Riesgo, Laura; Gomez-Limon, Jose Antonio.

En este trabajo se presenta un enfoque metodológico para el análisis de presiones e impactos de la aplicación conjunta de diferentes escenarios de política agraria y de tarifación del agua de riego. Para alcanzar dicho objetivo se asume que los agricultores consideran distintos criterios en la gestión de su actividad productiva. En este contexto decisional se utilizan modelos de programación matemática basados en la Teoría de la Utilidad Multiatributo (MAUT), de modo que pueda simularse el comportamiento de los agricultores en el futuro. Como resultado de dicha simulación no sólo se obtienen las variables de decisión de los agricultores (planes de cultivos), sino también un conjunto de indicadores económicos, sociales y ambientales que serán de utilidad...

Tipo: Journal Article

Palavras-chave: Multiple-Criteria Modelling; Irrigated Agriculture; Scenario Analysis; CAP; Water Policy.; Public Economics; Q25; Q15; C61.

Ano: 2005

URL: http://purl.umn.edu/28768

Properties of Flexible Functional Forms for Modeling Bilateral Export Supply and Import Demand in Multi-Country Agri-Food Models

Winter, Etti Maria; Frohberg, Klaus.

This paper illustrates the opportunities of incorporating more advanced functional forms into multi-country trade policy models. It suggests the use of flexible forms such as the Symmetric Generalized McFadden Function (SGMF) or the Normalized Quadratic-Quadratic Expenditure System (NQQES). Particularly if issues namely trade in differentiated products, preferential trade and effects of standards and traceability on bilateral trade are considered the NQQES offers attractive properties since it allows estimating variety specific expenditure elasticities which might compensate for example increased certification costs. A second aim of the paper refers to the critique on the handling of model parameters in calibrated policy models. In general, employed...

Economic Impacts of Soybean Rust on the US Soybean Sector

Palavras-chave: Bilateral trade modelling; Flexible functions; Calibration; International Relations/Trade; Research Methods/ Statistical Methods; B41; C61; F13; Q18; Q17.

Ano: 2005

URL: http://purl.umn.edu/24471

Gomez, Miguel I.; Nunez, Hector M.; Onal, Hayri.

The spread of Asian Soybean Rust (ASR) represents a real threat to the U.S. soybean sector. We assess the potential impacts of ASR on domestic soybean production and commodity markets as well as the competitive position of the US in the soybean export market. We develop a mathematical stochastic dynamic sector model with endogenous prices to assess the economic impacts of ASR on US agriculture. The model takes into account the disease spread during the cropping season, the inherent uncertainty regarding the risk of infection, and the dichotomous decisions that farmers make (no treatment, preventive treatment, and curative treatment) facing the risk of infection. Our results suggest substantial impacts from potential ASR spread on agricultural output,...

Efficiency analysis of producers’ organizations (Case of South Eastern and Central planning regions of Bulgaria)

Palavras-chave: Asian Soybean Rust; Stochastic Models; Dynamic Models; Agribusiness; Marketing; C61; Q13.

Ano: 2009

URL: http://purl.umn.edu/51177

Single payment scheme and dual values of land in PMP models

Zaimova, Darina.

The main aim of this paper is to compare two alternative methods for estimating frontier functions and measuring efficiency in production. The application of Data Envelopment Analysis (DEA) and Stochastic Frontier Analysis (SFA) to the same data panel provides insights in estimating technical efficiency of producers’ organizations in selected regions in Bulgaria.

Tipo: Journal Article

Palavras-chave: DEA; SFA; Technical efficiency; Frontier production; Farm efficiency; Community/Rural/Urban Development; International Development; C14; C23; C51; C61; C67; D24.

Ano: 2010

URL: http://purl.umn.edu/94636

Judez, Lucinio; de Andres, Rosario; Urzainqui, Elvira.

Land dual values are one of the important aspects of the results of mathematical programming models used to evaluate the impact of agricultural policy measures at regional and farm level. When the decoupling of direct payments and the payment entitlements per hectare are included in PMP models in the context of the Single Payment Scheme (SPS), the analysis of the land dual values is more complex than in models which do not take these aspects into account. In this paper, we present a theoretical analysis of the land dual values when the SPS is included in PMP farm models. This theoretical analysis is carried out for the base year (linear model) and for a simulated year (quadratic model).The results of this analysis are illustrated by comparing numerically...

On the Optimal Taxation of Common-Pool Resources

Palavras-chave: Positive mathematical programming; Single Payment Scheme or Single Farm Payment; Land dual values; Agricultural and Food Policy; C61; Q18.

Ano: 2011

URL: http://purl.umn.edu/98997

Kossioris, Georgios; Plexousakis, Michael; Xepapadeas, Anastasios; Fe Zeeuw, Aart.

Recent research developments in common-pool resource models emphasize the importance of links with ecological systems and the presence of non-linearities, thresholds and multiple steady states. In a recent paper Kossioris et al. (2008) develop a methodology for deriving feedback Nash equilibria for non-linear differential games and apply this methodology to a common-pool resource model of a lake where pollution corresponds to benefits and at the same time affects the ecosystem services. This paper studies the structure of optimal state- dependent taxes that steer the combined economic-ecological system towards the trajectory of optimal management, and provides an algorithm for calculating such taxes.