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A inserção do setor siderúrgico na economia capixaba: uma análise de insumo-produto AgEcon
Setto, Giani Claudia; Brasil, Gutemberg H.; Vieira, Wilson da Cruz.
The aim of this paper was to analyze the relative importance of the steel industry to the state of Espírito Santo, Brazil. The 1990 and 1999 Brazilian input-output matrices and Brazil’s regional accounts - state of Espírito Santo were used to build input-output matrices (1990 and 1999) to this state. Increases in final demand were simulated to analyze the effects on the production of each sector as well as on employment creation in this state. Backward and forward linkage indexes were also computed to twelve sectors with the same purpose. The results show that the steel industry is very important to the capixaba economy especially due to the high multiplier effects in response to increases in final demand. The results show also that the relative importance...
Tipo: Journal Article Palavras-chave: Steel industry; Input-output; Linkage index; State of Espírito Santo; Production Economics.
Ano: 2005 URL: http://purl.umn.edu/56747
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Alocação dos custos de melhorias em bacias hidrográficas entre os usuários de água: uma aplicação do valor de Shapley AgEcon
Leite, Gil Bracarense; Vieira, Wilson da Cruz.
The objective of this work was to analyze the cost allocation of improvements in river basins among the water users. It was used, as example, the Paraíba do Sul river basin, located in the states of Minas Gerais, São Paulo and Rio de Janeiro, and, as criteria of allocation of costs, they were used the volumes of water extracted and consumed, and the quantity of pollutants deposited in the basin area by water users. The methodology used consists of the rule of allocation known as Shapley value, which belongs to the cooperative branch of game theory. In the case of Paraíba do Sul river basin, the values found indicated that the urban users should pay the higher part of the costs of improvements, given that these users are responsible for most of the...
Tipo: Journal Article Palavras-chave: Water resources; Cost allocation; Shapley value; Paraíba do Sul River basin; Environmental Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/53845
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Alocação dos custos de melhorias em bacias hidrográficas entre os usuários de água: uma aplicação do valor de Shapley AgEcon
Leite, Gil Bracarense; Vieira, Wilson da Cruz.
The objective of this work was to analyze the cost allocation of improvements in river basins among the water users. It was used, as example, the Paraíba do Sul river basin, located in the states of Minas Gerais, São Paulo and Rio de Janeiro, and, as criteria of allocation of costs, they were used the volumes of water extracted and consumed, and the quantity of pollutants deposited in the basin area by water users. The methodology used consists of the rule of allocation known as Shapley value, which belongs to the cooperative branch of game theory. In the case of Paraíba do Sul river basin, the values found indicated that the urban users should pay the higher part of the costs of improvements, given that these users are responsible for most of the...
Tipo: Working or Discussion Paper Palavras-chave: Water resources; Cost allocation; Shapley value; Paraíba do Sul river basin; Environmental Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/53385
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Aplicação de sistema de apoio à decisão no planejamento de pequenas propriedades produtoras de leite da microrregião de Viçosa - MG AgEcon
Lana, Clarisse Maia; da Silva Junior, Aziz Galvao; Vieira, Wilson da Cruz.
A pecuária de leite nacional, nos últimos anos, vem passando por importantes transformações, impulsionadas pela necessidade de adaptação dos sistemas de produção de leite a um ambiente de maior competição. Diante desse cenário, este estudo buscou desenvolver um sistema de apoio à decisão (SAD) para auxiliar na alocação de recursos de pequenas propriedades produtoras de leite da microrregião de Viçosa - MG, visando à melhoria da rentabilidade na atividade leiteira. O sistema desenvolvido permite alocar os recursos (terra, mão-de-obra e animais) disponíveis, para a maximização da margem bruta anual por meio de um modelo de programação linear, e facilita a análise econômica dos sistemas de produção, mediante uma planilha de custo que é gerada pelos resultados...
Tipo: Journal Article Palavras-chave: Produção de leite; Sistema de apoio à decisão; Alocação de recursos; Programação linear.; Farm Management.
Ano: 2003 URL: http://purl.umn.edu/56827
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Choques monetários e cambiais e preços relativos na economia brasileira: 1990-2000 AgEcon
Cunha, Cleyzer Adrian da; Vieira, Wilson da Cruz.
Neste trabalho analisou-se o comportamento de preços agrícolas e industriais em resposta a choques monetários e cambiais não-antecipados na economia brasileira, no período de janeiro de 1990 a dezembro de 2000. Considerou-se um ambiente econômico em que há perfeita mobilidade de capital entre a economia doméstica e o resto do mundo, existe arbitragem internacional no mercado de commodities agrícolas e os bens industriais domésticos são substitutos imperfeitos dos seus equivalentes importados. Desenvolveu-se um modelo teórico na mesma linha dos chamados modelos de overshooting. Os resultados empíricos encontrados corroboram a hipótese de que os preços agrícolas respondem mais intensamente, no curto prazo, aos choques monetários e cambiais não-antecipados,...
Tipo: Journal Article Palavras-chave: Preços relativos; Política cambial; Choques monetários; Research Methods/ Statistical Methods.
Ano: 2003 URL: http://purl.umn.edu/56847
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Determinantes do desmatamento em pequenas propriedades na Amazônia: um estudo de caso em Uruará - PA AgEcon
Pereira, Ritaumaria de J.; Vieira, Wilson da Cruz; Lima, Joao Eustaquio de; Caldas, Marcellus Marques.
The main objective of this paper was to analyse the factors that influence deforestation in small rural farms of a colonization area in Brazil’s Amazon Region. It was used data from 138 small farms distribuited over the transamazonic road in the municipality of Uruará, PA. The data was collected during july and august of 2002. A Tobit model with sample selectivity with etimation in two stages (Heckman) was used. In the first stage, the probability of deforestation was explained mainly by the presence of cattle in the farm. In the second stage, the deforestation area was modeled as a function of various factors. The results showed that the main determinants of deforestation are the amount paid for lired labor, the distance from the main road, the number of...
Tipo: Journal Article Palavras-chave: Brasilian Amazon; Deforestation; Colonization; Tobit model; Environmental Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/56790
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Dinâmica de sistemas aplicada à gestão de recursos hídricos em bacia hidrográfica AgEcon
Vieira, Wilson da Cruz.
The objective of this work was to analyze both the allocation of water among competing demands in a river basin and pricing policies for water. Based on a theoretical model that maximizes the net social benefits from the allocation of water over a finite period of time, it was used the dynamic systems approach to analyze various issues related to water resources management in a river basin, such as sustainability of water resources, and water pricing. The model was applied to the Araguari River Basin, located in the State of Minas Gerais.
Tipo: Journal Article Palavras-chave: River basin; System dynamics; Water resources; Water pricing; Sustainability; Environmental Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/53856
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Efeitos redistributivos de transferência de renda e redução tributária nos setores agropecuário e agroindustrial AgEcon
Santos, Vladimir Faria dos; Vieira, Wilson da Cruz; Reis, Bricio dos Santos.
This work analyzes the effects of alternative policies on income redistribution in the Brazilian economy. It was used an applied general equilibrium model and the following simulations were implemented: direct income transfer and tax reduction on agriculture and agro-industry sectors. The results indicated that direct income transfer is a better policy to reduce income inequality than tax reduction on specific sectors such as agriculture and agro-industry.
Tipo: Journal Article Palavras-chave: Income distribution; Taxation; General equilibrium; Brazil; Political Economy.
Ano: 2007 URL: http://purl.umn.edu/54136
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EFICIÊNCIA TÉCNICA EM PROPRIEDADES LEITEIRAS DA MICRORREGIÃO DE VIÇOSA-MG: UMA ANÁLISE NÃO-PARAMÉTRICA AgEcon
Santos, Jeronimo Alves dos; Vieira, Wilson da Cruz; Baptista, Antonio Jose Medina dos Santos.
The main objective of this paper was to evaluate the technical efficiency in 17 milk production farms in the region of Viçosa, state of Minas Gerais, during the period 1999-2002. These farms have received technical assistance from a program created by the Federal University of Viçosa and Nestlé. The technical efficiency was evaluated through the Data Envelopment Analysis (DEA) technique. The results obtained show that there are still a significant proportion of inefficient farms. It was also observed that the farms have become more homogeneous in their production characteristics which is probably due to the pattern of technical assistance adopted during the period analyzed.
Tipo: Journal Article Palavras-chave: DEA; Technical efficiency; Milk production; Livestock Production/Industries; Productivity Analysis.
Ano: 2005 URL: http://purl.umn.edu/43979
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Eficiência técnica na produção de leite em pequenas propriedades da microrregião de Viçosa - MG AgEcon
Santos, Jeronimo Alves dos; Vieira, Wilson da Cruz; Baptista, Antonio Jose Medina dos Santos.
This work evaluated the technical efficiency of productive resources utilization in small milk production farmers located in Viçosa region, Minas Gerais, Brazil. The study comprised small milk producers who have received technical assistance from a program created by the Federal University of Viçosa and Nestlé. The technical efficiency was evaluated using the Data Envelopment Analysis (DEA) technique. The results obtained show that there are some farmers efficient and others inefficient. It was also observed that, during the 1999-2003 period, the technical efficiency has improved in the most of the farmers analyzed.
Tipo: Journal Article Palavras-chave: DEA; Technical efficiency; Milk production; Farm Management.
Ano: 2004 URL: http://purl.umn.edu/56801
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Portfolio selection models: comparative analysis and applications to the Brazilian stock market AgEcon
Farias, Christiano Alves; Vieira, Wilson da Cruz; Santos, Maurinho Luiz dos.
This paper presents a comparison of three portfolio selection models, Mean-Variance (MV), Mean Absolute Deviation (MAD), and Minimax, as applied to the Brazilian Stock Market (BOVESPA). For this comparison, we used BOVESPA data from three different 12 month time periods: 1999 to 2000, 2001, and 2002 to 2003. Each model generated three optimal portfolios for each period, with performance determined by monthly returns over the period. In general, the accumulated returns from the Minimax modeled portfolios were superior to the BOVESPA’s principal index, the IBOVESPA. The MV model was the least efficient for portfolio selection.
Tipo: Journal Article Palavras-chave: Portfolio selection; Stock market; Brazil; Financial Economics.
Ano: 2006 URL: http://purl.umn.edu/55187
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Programming languages in economics: a comparison among Fortran77, C++, and Java AgEcon
Vieira, Wilson da Cruz; Lelis, Levi H. Santana de.
The main objective of this paper was to compare the computer programming languages Fortran77, C++, and Java under four aspects: runtime efficiency, readability, ease of learning, and reliability. For this comparison, we revised the specialized literature on programming languages and used pieces of codes of these three programming languages. The purpose of this comparison was to provide some objective information for economists interested in learning one or more of these languages.
Tipo: Journal Article Palavras-chave: Programming language; Runtime efficiency; Readability; Reliability; Teaching/Communication/Extension/Profession.
Ano: 2005 URL: http://purl.umn.edu/56733
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RENTABILIDADE E RISCO DE SISTEMAS ALTERNATIVOS DE PRODUÇÃO DE LEITE EM PEQUENAS PROPRIEDADES DA MICRORREGIÃO DE VIÇOSA, MG AgEcon
Oliveira, Gabriel Leao; Vieira, Wilson da Cruz.
The main objective of this work was to analyze the trade between income and risk related to the alternative milk production systems in the region of Viçosa, Minas Gerais, supported by the Federal University of Viçosa and Nestlé. A standard linear programming model provided the identification of the best options among the activities displayed for the maximization of the gross annual income. By means of the rentability calculation of the different milk production systems and risk linked to them it was possible to identify that the milk producers behaved differently in relation to the risk. Generally the producers who are more dependent to the milk activity for their survival are more adverse to risk.
Tipo: Journal Article Palavras-chave: Risk; Linear programming; Milk production..
Ano: 2006 URL: http://purl.umn.edu/43811
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Teoria dos jogos e seleção de portfólio: uma proposta de adaptação ao modelo minimax e aplicação ao mercado acionário brasileiro AgEcon
Farias, Christiano Alves; Vieira, Wilson da Cruz; Santos, Maurinho Luiz dos.
The objective of this paper was to compare and to analyze three portfolio selection models: Mean-Variance, Minimax and Minimax Weighted. These models were evaluated using historical data (September 1999 to August 2000, January 2001 to December 2001 and February 2002 to January 2003) obtained from the Brazilian Stock Market (Bovespa). They were selected optimal portfolios to each month based on the returns of the last twelve months. The results show that the returns obtained through the Mean-Variance model were superiors in certain circumstances and inferiors in others when compared to the Ibovespa index. The Minimax model obtained the best accumulated returns when compared with the others models and the Ibovespa index.
Tipo: Journal Article Palavras-chave: Portfolio selection; Mean-variance; Bovespa; Game theory; Financial Economics.
Ano: 2004 URL: http://purl.umn.edu/56814
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Uso de dinâmica de sistemas como suporte à decisão em propriedades produtoras de leite: um estudo de caso AgEcon
Avila, William Romell Benevides de; Lirio, Viviani Silva; Santos, Maurinho Luiz dos; Vieira, Wilson da Cruz.
The adequade management is the main factor of success in the milk production activity. In view of this, the objective of this paper was to develop a decision support tool based in system dynamics to be appled to this activity. To perform the simulations with the model they were used data from a representative milk production farm of the state of Minas Gerais, Brazil. The results obtained with simulations showed coherence with settled previously analysis. The system dynamics showed also to be very helpful to get a better understanding of milk production systems and to perform strategic planning.
Tipo: Journal Article Palavras-chave: System dynamics; Milk production; Strategic planning; Farm Management.
Ano: 2004 URL: http://purl.umn.edu/56773
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