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Registros recuperados: 337
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A Case Study of Regulation in Zambia’s Cotton Sector. AgEcon
Tschirley, David L.; Kabwe, Stephen.
Cotton is an unquestioned success of Zambia’s turn towards a market economy. After privatization in late 1994, seed cotton production rose from 32,000 metric tons (mt) to about 180,000 mt a decade later (three-year averages centered on 1994 and 2005). The number of farmers involved in the sector grew similarly, yields trended upwards (though slowly), and the country dramatically improved the quality of its lint, becoming the outstanding performer in Sub-Saharan Africa in this regard by the mid-2000s. Yet the sector has experienced two serious crashes since reform, both involving rampant credit default by farmers supported with seasonal input credit by ginning companies.
Tipo: Working or Discussion Paper Palavras-chave: Zambia; Cotton; Africa; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Food Security and Poverty; International Development; Q10; Q11; Q12.
Ano: 2010 URL: http://purl.umn.edu/62145
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A comparative efficiency analysis of wheat farms using parametric and nonparametric methods AgEcon
Mo, Lijia.
This study examined whether the efficiency measures were invariant to choice of parametric and nonparametric methods for a sample of 183 wheat farms. The efficiency measures from the deterministic parametric method were smaller than those from the deterministic method. There was a trade-off between scale efficiency and economic efficiency. In the deterministic nonparametric method, the economic efficiency, scale efficiency and overall efficiency results were invariant to the number of inputs or the dimensionality. Only allocative and pure technical efficiency measures depended on the dimensionality. This work illustrated the importance of holding curvature for the cost function in stochastic frontier results.
Tipo: Conference Paper or Presentation Palavras-chave: Efficiency analysis; Deterministic nonparametric method; Parametric stochastic frontier; Production Economics; Q11.
Ano: 2009 URL: http://purl.umn.edu/56427
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A Comparative Study of China's and Australia's Cotton Production AgEcon
Zhao, Xufu; Tisdell, Clement A..
After providing information about the global importance of cotton as a textile and China’s and Australia’s contribution to global cotton production, this paper examines and compares trends in the time-series of cotton production of China and Australia for the period 1980-2007. In doing so, it takes account of changes in the area planted with cotton and its yield. Correlation estimates and decomposition analysis are used to determine the relative contribution to variations in the total output of cotton of changes in the total area planted with cotton and its yield in both countries. These relative contributions are found to be quite different for Australia and China. In addition, there is a comparative analysis of fluctuations in the production of cotton,...
Tipo: Working or Discussion Paper Palavras-chave: Australia; Agricultural economics; China; Cotton production; Cotton supply responses; Fibre markets; Fluctuations in agricultural production; Crop Production/Industries; International Relations/Trade; Q00; Q10; Q11; Q13; Q18; Q19.
Ano: 2009 URL: http://purl.umn.edu/90622
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A Comparison of Imputation Methods under Large Samples and Different Censoring Levels (PowerPoint) AgEcon
Lopez, Jose Antonio.
PowerPoint Presentation
Tipo: Conference Paper or Presentation Palavras-chave: Imputation methods; Multiple imputation; Censored prices; Protein demand; Elasticities; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; C81; Q11; R21.
Ano: 2011 URL: http://purl.umn.edu/109894
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A Hedonic Analysis on the Implicit Values of Fresh Tomatoes AgEcon
Huang, Chung L.; Lin, Biing-Hwan.
The food habits and dietary patterns of American consumers are changing and they are increasingly demanding food products that possess certain attributes relating to how the food was produced or processed. The objectives of the study are to analyze household purchase of fresh tomatoes and to determine the magnitudes of the price premium paid for the organic tomatoes by estimating a hedonic price model. The study uses the 2003 ACNielsen Homescan panel data. The data set represents a nationally representative panel of U.S. households, which provide food purchase data for at-home consumption. For empirical implementation, parameters of the hedonic model were estimated using the Box-Cox transformation procedure. The results indicated that consumers value the...
Tipo: Conference Paper or Presentation Palavras-chave: Box-Cox transformation; Fresh tomatoes; Hedonic price; Organic produce; Product attributes; Crop Production/Industries; D1; Q11.
Ano: 2006 URL: http://purl.umn.edu/25404
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A Hedonic Metric Approach to Estimating the Demand for Differentiated Products: An Application to Retail Milk Demand AgEcon
Gulseven, Osman; Wohlgenant, Michael K..
This article introduces the Hedonic Metric (HM) approach as an original method to model the demand for differentiated products. Using this approach, initially we create an n-dimensional hedonic space based on the characteristic information available to consumers. Next, we allocate products into this space and estimate the elasticities using distances. What distinguishes our model from traditional demand models such as Almost Ideal Demand System (AIDS) and Rotterdam Model is the way we link elasticities with product characteristics. Moreover, our model significantly reduces the number of parameters to be estimated, thereby making it possible to estimate large number of differentiated products in a single demand system. We applied our model to estimate the...
Tipo: Conference Paper or Presentation Palavras-chave: Hedonic Metrics; Distance Metrics; Rotterdam Model; Almost Ideal Demand System; Differentiated Products; Milk Demand.; Food Security and Poverty; C30; C80; Q11; Q13; Q18.
Ano: 2010 URL: http://purl.umn.edu/91675
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Aggregation and Calibration of Agricultural Sector Models Through Crop Mix Restrictions and Marginal Profit Adjustments AgEcon
Wiborg, Torben; McCarl, Bruce A.; Rasmussen, Svend; Schneider, Uwe A..
All agricultural sector models must deal with aggregation and calibration somehow. The aggregation problem involves treating a group of producers as if they all responded in the same way as a single representative unit. The calibration problem concerns making a model reproduce as closely as possible an empirically observed set of decision maker actions. This paper shows how both calibration and aggregation are addressed through crop mix restrictions combined with marginal profit adjust-ments.
Tipo: Conference Paper or Presentation Palavras-chave: Mathematical programming; Aggregation; Calibration; Crop mix; Marginal cost; Agricultural sector model; Agribusiness; C6; C61; Q1; Q11; Q17; Q18; R12; R13; R14.
Ano: 2005 URL: http://purl.umn.edu/24567
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Agricultural Globalization in Reverse: The Impact of the Food Crisis in West Africa AgEcon
Staatz, John M.; Dembele, Niama Nango; Kelly, Valerie A.; Adjao, Ramziath.
Background paper for the Geneva Trade and Development Forum Crans-Montana, Switzerland September 17-20, 2008
Tipo: Conference Paper or Presentation Palavras-chave: Africa; Globalization; Food Security and Poverty; International Relations/Trade; Q11.
Ano: 2008 URL: http://purl.umn.edu/55466
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Agricultural Impacts of Biofuels Production AgEcon
Walsh, Marie E.; Torre Ugarte, Daniel de la; English, Burton C.; Jensen, Kimberly L.; Hellwinckel, Chad M.; Menard, R. Jamey; Nelson, Richard G..
Analysis of the potential to supply 25% of projected 2025 U.S. transportation fuels indicates sufficient biomass resources are available to meet increased demand while simultaneously meeting food, feed, and export needs. Corn and soybeans continue to be important feedstocks for ethanol and biodiesel production, but cellulose feedstocks (agricultural crop residues, energy crops such as switchgrass, and forestry residues) will play a major role. Farm income increases, mostly because of higher crop prices. Increased crop prices increase the cost of producing biofuels.
Tipo: Journal Article Palavras-chave: Biodiesel; Biofuels; Biomass; Cellulose feedstocks; Crop residues; Ethanol; Forest residues; Switchgrass; Agribusiness; Resource /Energy Economics and Policy; O11; Q11; Q41.
Ano: 2007 URL: http://purl.umn.edu/6514
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Agricultural Policy Indicators AgEcon
Josling, Timothy E.; Valdes, Alberto.
This paper outlines a methodological approach for use by FAO to collect, analyze and monitor agricultural policy indicators (API) for developing countries. The aim is to establish a consistent and comparable set of policy indicators, allowing analysts to examine whether agriculture in particular countries is being stimulated or retarded by the set of policies employed. The API should also be useful in the context of quantitative models of policy impacts and market projections. Ideally, the indicators should function as building blocks for the more comprehensive policy measurement. This paper is presented in four parts. Part I gives an overview of the rationale for monitoring, the relationship between policy monitoring, quantitative modeling and evaluation,...
Tipo: Working or Discussion Paper Palavras-chave: Agricultural policy; Trade and development; Policy indicators; Domestic support; Agricultural and Food Policy; Q11; Q17; Q18; O10; O19.
Ano: 2004 URL: http://purl.umn.edu/23789
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Alfalfa Hay Quality and Alternative Pricing Systems AgEcon
Hopper, Jared A.; Peterson, Hikaru Hanawa; Burton, Robert O., Jr..
Price-quality relationships for alfalfa hay were analyzed by hedonic pricing models using 1996-2001 Wisconsin auction data. Individual nutrients included in the analysis all affected alfalfa price, with acid detergent fiber accounting for the largest impact. Alternative pricing models, based on an aggregate quality index or detailed quality information, were similar in their ability to predict price. However, disaggregating price predictions to account for differences in relative feed value (RFV) and crude protein (CP) indicate that both RFV and CP are important determinants of price and that aggregating the two into a quality index is not warranted.
Tipo: Journal Article Palavras-chave: Aggregate index; Alfalfa; Auction data; Hedonic pricing models; Quality; Q11.
Ano: 2004 URL: http://purl.umn.edu/43462
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Alternative Theories and Empirical Approaches to Price Discovery: An Application to Fed Cattle AgEcon
Carlberg, Jared G.; Ward, Clement E..
Price discovery is a frequent topic of research, but many times is not clearly defined and thus purported to cover a myriad of topics. This article provides two alternative theories as the basis for one line of price discovery research. Empirical models consistent with the two theories are estimated using a common data set. Empirical results differ as expected. This article evidences why the theoretical basis for an empirical model depends on clearly defining the objective(s) of the research.
Tipo: Journal Article Palavras-chave: Derived demand; Fed cattle; Partial adjustment model; Price discovery; Q13; Q11; Q12; C51; C22.
Ano: 2003 URL: http://purl.umn.edu/43201
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An Analysis of Demand Elasticities for Fluid Milk Products in the U.S. AgEcon
Davis, Christopher G.; Blayney, Donald P.; Cooper, Joseph C.; Yen, Steven T..
This study examines retail fluid milk products purchase data from Nielsen 2005 home scan data. The demand for seven categories of fluid milk products were estimated: whole milk, whole flavored milk, reduced fat milk, flavored reduced fat milk, buttermilk, canned milk and all other fluid milk products. Analyses of the purchases of seven fluid milk categories based on the Nielsen 2005 home scan retail data are used to determine the roles marital status, age, race, education, female employment status and location play in the empirical estimations of aggregate demand elasticities. To derive the demand elasticities, a censored translog demand system is used. The results reveal that price and income are the main determinants of demand for fluid milk products...
Tipo: Conference Paper or Presentation Palavras-chave: Nielsen home scan retail data; Milk demand; Elasticities; Fluid milk; Reduced fat milk; Whole milk; Flavored milk; Canned milk; Buttermilk; Non-linear AIDS; Censored translog demand system; Consumer/Household Economics; Demand and Price Analysis; C25; D12; Q11.
Ano: 2009 URL: http://purl.umn.edu/51791
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An Analysis of Latin American Peanut Trade AgEcon
Lee, Dae-Seob; Kennedy, P. Lynn; Fletcher, Stanley M..
The U.S. export share in the world peanut market has decreased due to heavy competition. In this paper, the Latin American peanut industry is modeled using seemingly unrelated regression (SUR). Based on these estimations, a scenario analysis was conducted. The results show that the Latin American demand is not affected dramatically by either domestic of world price shocks. The effects of price changes on net trade are noticeable. However, the world price does not significantly affect the Latin American peanut supply. The results imply that Latin American peanut farmers are more sensitive to changes in domestic prices than world price changes.
Tipo: Journal Article Palavras-chave: Agricultural trade; Latin America; Peanuts; Scenario analysis; SUR; Demand and Price Analysis; International Relations/Trade; Q11; Q17.
Ano: 2006 URL: http://purl.umn.edu/43744
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AN ASSESSMENT OF DYNAMIC BEHAVIOR IN THE U.S. CATFISH MARKET: AN APPLICATION OF THE GENERALIZED DYNAMIC ROTTERDAM MODEL AgEcon
Muhammad, Andrew; Jones, Keithly G..
Dynamic demand systems have been employed in a number of studies to account for habit formation and inventory adjustments in demand. Few studies have attempted to provide a theoretical foundation for the dynamic demand structures employed. Recently, Bushehri (2003) showed how a generalized dynamic Rotterdam model could be derived from the neoclassical intertemporal utility maximization problem; however, no empirical application is provided in his study. This paper provides an empirical application of the generalized dynamic Rotterdam model to the demand for processed catfish products in the U.S. The two-period dynamic Rotterdam model explained a significant amount of the variation in U.S. catfish demand and was preferred to the one-period and static...
Tipo: Conference Paper or Presentation Palavras-chave: Dynamic; Rotterdam model; Catfish; Demand; Partial adjustment; Demand and Price Analysis; Research Methods/ Statistical Methods; Q11; Q13.
Ano: 2008 URL: http://purl.umn.edu/45912
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An Assessment of Dynamic Behavior in the U.S. Catfish Market: An Application of the Generalized Dynamic Rotterdam Model AgEcon
Muhammad, Andrew; Jones, Keithly G..
The generalized dynamic Rotterdam model was used in estimating U.S. demand for disaggregated catfish. The overall goal was to examine habit persistence in consumption and to determine the adjustment process in demand. Results indicated that it took up to 1 month for catfish-product demand to fully adjust to changes in expenditures and prices. Additionally, habit persistence played a role in demand where present consumption of a given product was positively affected by past consumption of that product. Consequently, U.S. catfish demand was significantly more elastic in the long-run.
Tipo: Journal Article Palavras-chave: Catfish; Demand; Dynamics; Partial adjustment; Rotterdam model; Agribusiness; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Institutional and Behavioral Economics; C51; Q11; Q13; Q17.
Ano: 2009 URL: http://purl.umn.edu/56660
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An Empirical Investigation of Live-Hog Demand AgEcon
Parcell, Joseph L.; Mintert, James R.; Plain, Ronald L..
An inverse live-hog model was estimated to analyze whether there has been a recent increase in the magnitude of live-hog, own-quantity demand flexibility. Estimating the impact of processing capacity-utilization rate changes on live-hog prices was a second objective of this research. Results indicate that live hog prices have become more responsive to changes in hog slaughter, slaughter weight, cold storage stocks, and changes in the processing capacity-utilization rate. Finally, model results indicate that the sharp increase in processing capacity-utilization rates, the increase in average dressed weight, and the increase in hog slaughter all had a negative effect on the live-hog prices.
Tipo: Journal Article Palavras-chave: Capacity utilization; Live hog demand; Structural change; Q11; Q12; Q13; D40.
Ano: 2004 URL: http://purl.umn.edu/43476
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An Evaluation of Crop Forecast Accuracy for Corn and Soybeans: USDA and Private Information Agencies AgEcon
Egelkraut, Thorsten M.; Garcia, Philip; Irwin, Scott H.; Good, Darrel L..
Using 1971-2000 data, we examine the accuracy of corn and soybean production forecasts provided by the USDA and two private agencies. All agencies improved their forecasts as the harvest progressed, and forecast errors were highly correlated and unbiased. The relative forecast accuracy of the agencies varied by crop and month. For corn, USDA’s forecasts ranked as most accurate of the three agencies in all periods except for august during the recent period and improved most markedly as harvest progressed. For soybeans, forecast errors were very similar, with the private agencies ranking as most accurate for August and September and making largest relative improvements for August during the recent period. The USDA forecasts were dominant for October and...
Tipo: Journal Article Palavras-chave: Corn; Private agencies; Production forecasts; Soybeans; USDA; Q11; Q13; C82; Q18.
Ano: 2003 URL: http://purl.umn.edu/37835
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An ex-ante analysis of distributional effects of the CAP on western German farm incomes AgEcon
Deppermann, Andre; Grethe, Harald; Offermann, Frank.
This study is concerned with measuring impacts of the Common Agricultural Policy (CAP) on farm income distribution of western Germany. Not only the sheer contribution of market price support and direct payments as a proportion of income is taken into account, but also the impact of support on production incentives. For this purpose, we apply a modelling system consisting of a partial equilibrium model and a programming model. Based on a comparison of Gini coefficients and a decomposition of overall inequality effects we conclude that liberalization of the agricultural sector leads to a more unequal distribution of family farm income in relative terms, whereas a liberalized market provides a more equal situation in absolute terms.
Tipo: Conference Paper or Presentation Palavras-chave: Income distribution; CAP; Farm Group Model; Equilibrium Model; Agricultural and Food Policy; Q11; Q12; Q18; C54; C6; D31.
Ano: 2011 URL: http://purl.umn.edu/99428
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Analyse des prix de parité en Afrique de l’Ouest : Le cas du riz depuis la crise de 2007-2008. Rapport de synthèse provisoire. AgEcon
Diallo, Boubacar Cisse; Dembele, Niama Nango; Staatz, John M..
ATELIER REGIONAL DE VALIDATION DE L’ETUDE SUR LES PRIX DE PARITE DU RIZ EN AFRIQUE DE L’OUEST
Tipo: Working or Discussion Paper Palavras-chave: Parity price; Rice; Mali; Agricultural and Food Policy; Food Security and Poverty; Marketing; Q11.
Ano: 2010 URL: http://purl.umn.edu/57243
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