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Registros recuperados: 36
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Estimation Issues in Single Commodity Gravity Trade Models AgEcon
Prehn, Soren; Brümmer, Bernhard.
Recently gravity trade models are applied to disaggregated trade data. Here many zeros are characteristic. In the presence of excess zeros usual Poisson Pseudo Maximum Likelihood (PPML) is still consistent, the variance covariance matrix however is invalid. Correct economic interpretation however requires also the last. So alternative estimators are looked for. Staub & Winkelmann [2010] argue that zeroinflated count data models (i.e. zero-inflated Poisson / Negative Binomial Pseudo Maximum Likelihood (ZIPPML / ZINBPML)) are no alternative since under model misspecification these estimators are inconsistent. Yet zero-inflated Poisson Quasi- Likelihood (PQL) is a reliable alternative. It is consistent even under model misspecifications and beyond that...
Tipo: Conference Paper or Presentation Palavras-chave: Gravity Model; Homogeneous Firm Trade Model; Excess Zeros; Overdispersion; Negatively Skewed Distribution; Poisson Quasi Likelihood; Two Part Model; International Relations/Trade.
Ano: 2011 URL: http://purl.umn.edu/114776
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Auction Experiments and Simulations of Milk Quota Exchanges AgEcon
Brümmer, Bernhard; Loy, Jens-Peter; Requate, Till.
Since 2000 Germany has introduced a fairly unique market mechanism to trade milk quotas between dairy farms. The two major features are: (1) a quasi auctioning system that produces excess demands which are covered by state reserves free of charge and (2) a price band that is used to exclude highest bids. For both features an experimental design is developed to study the impact in reference to a regular seller’s sealed bid double auction. Results show that both treatments lead to significant misallocations. These are due to the direct impact of regulations and due to an imperfect adjustment of bidding functions. The major goal of the market design to reduce quota prices is reached, however, at significant trade losses.
Tipo: Conference Paper or Presentation Palavras-chave: Livestock Production/Industries.
Ano: 2011 URL: http://purl.umn.edu/114377
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INVESTIGATING RAPESEED PRICE VOLATILITIES IN THE COURSE OF THE FOOD CRISIS AgEcon
Busse, Stefan; Brümmer, Bernhard; Ihle, Rico.
C2_3
Tipo: Conference Paper or Presentation Palavras-chave: Multivariate GARCH; MATIF; Rapeseed; Crude oil; Volatilities; Food crisis; Demand and Price Analysis; Research Methods/ Statistical Methods; C32; E44; G1; Q11; Q13; Q49.
Ano: 2010 URL: http://purl.umn.edu/93957
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How Effective is the Invisible Hand? Agricultural and Food Markets in Central and Eastern Europe AgEcon
Hockmann, Heinrich; Brosig, Stephan; Popp, Jozsef; Wilkin, Jerzy; Juchniewicz, Małgorzta; Milczarek, Dominika; Ferto, Imre; Forgacs, Csaba; Juhasz, Aniko; Kurthy, Gyongyi; Hein, Piret; Hobbs, Jill E.; Nuppenau, Ernst-August; Brümmer, Bernhard; Zorya, Sergiy; Bakucs, Lajos Zoltan; Bojnec, Stefan; Svetlov, Nikolai M.; Hurrelmann, Annette; Maack, Kai; Hanf, Jon Henrich; Glauben, Thomas; Herzfeld, Thomas; Wang, Xiaobing; Balint, Borbala; Lerman, Zvi; Shagaida, Natalya; Benner, Eckhard; Wandel, Jurgen; Nivievskyi, Oleg; Kuhn, Arnim.
Since the seminal work of Adam Smith, markets have been considered an efficient tool for co-ordinating the behaviour of economic agents. The basic characteristic of a market economy is that the complex system of interaction among individuals is not centrally coordinated. Under the assumption of profit and utility maximisation (and a whole set of assumptions about the institutional framework), relative prices and their change over time provide the signals that guide, like an invisible hand, the allocation of resources, i.e., the structure of production and the intensity of input use in the various production processes. They do this by co-ordinating the activities of economic agents, i.e., of resource owners, producers, intermediaries, traders, and...
Tipo: Book Palavras-chave: Agribusiness; Community/Rural/Urban Development; Industrial Organization; International Development; Labor and Human Capital; Land Economics/Use; Political Economy.
Ano: 2005 URL: http://purl.umn.edu/93018
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Farmer Participation in Supermarket Channels, Production Technology and Technical Efficiency: The Case of Vegetables in Kenya AgEcon
Rao, Elizaphan J.O.; Brümmer, Bernhard; Qaim, Matin.
Supermarkets are currently gaining ground in the agri-food systems of many developing countries. While recent research has analyzed income effects in the small farm sector, impacts on farming efficiency have hardly been studied. Productivity effects in previous studies are also estimated with respect to different frontiers. Using a survey of Kenyan vegetable growers and a meta-frontier approach, we control for self-selection using propensity score matching and show that participation in supermarket channels increases farm productivity by 35-38%. Effects on technical efficiency are, however, insignificant. Supermarket expansion therefore presents opportunities for realizing agricultural growth, thus enhancing poverty alleviation and rural development.
Tipo: Conference Paper or Presentation Palavras-chave: Supermarkets; Meta-frontier; Productivity; Meta-technology ratio; Sample selection; Kenya; Agribusiness; Community/Rural/Urban Development; International Development; Production Economics; Productivity Analysis.
Ano: 2010 URL: http://purl.umn.edu/61190
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Determinants of Land Use Change Dynamics in the Margins of Protected Forest Areas: Evidence from Central Sulawesi, Indonesia AgEcon
Reetz, Sunny W.H.; Brümmer, Bernhard.
Tipo: Conference Paper or Presentation Palavras-chave: Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/114794
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HOW DID POLICY INTERVENTIONS IN WHEAT EXPORT MARKETS IN RUSSIA AND UKRAINE DURING THE FOOD CRISIS 2007/2008 INFLUENCE WORLD MARKET PRICE TRANSMISSION? AgEcon
Goetz, Linde; Glauben, Thomas; Brümmer, Bernhard.
C1_2
Tipo: Conference Paper or Presentation Palavras-chave: International price transmission; Wheat market; Food crisis; Markov switching error correction model; Russia; Ukraine; Agricultural and Food Policy; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2010 URL: http://purl.umn.edu/93952
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Market integration and price leadership in selected sugar markets. The case of Colombia, Brazil and the world AgEcon
Bugueiro, Mauricio; Brümmer, Bernhard; Diaz, Jose.
Published by Asociación de Economistas Agrarios de Chile
Tipo: Journal Article Palavras-chave: Market integration; Cointegration; Law of one price; Vector error correction models; Agribusiness; Marketing.
Ano: 2010 URL: http://purl.umn.edu/104405
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Beurteilung des Milchquotenbörsensystems in Deutschland AgEcon
Brümmer, Bernhard; Loy, Jens-Peter; Struve, Carsten.
In this paper the newly established rules for trading milk quotas in Germany are analyzed. These regulations have been in force since April 2000. Following a brief historical review of the quota system, the major changes in economic incentives regarding trading milk and the expected welfare implications are derived. Next, the effects of the new trading rules on quota prices in comparison to a reference system (sealed bid double auction) are discussed. In the empirical part the significance of the theoretical effects is illustrated. Recent changes in the regulations for quota trade are shown to have little effect in terms of mitigating these problems.
Tipo: Journal Article Palavras-chave: Rules for milk quota trading; Auctions; Agricultural and Food Policy; Financial Economics.
Ano: 2003 URL: http://purl.umn.edu/97978
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Wheat / Flour Price Transmission and Agricultural Policies in Ukraine: A Markov-Switching Vector Error Correction Approach AgEcon
Brümmer, Bernhard; Zorya, Sergiy.
The analysis of price transmission between raw and processed agricultural products in transition countries is complicated by the frequently changing conditions on their way from plan to market. We utilise a Markov-switching vector error correction model to allow for multiple regime shifts in the price relationship between wheat and wheat flour in Ukraine from June 2000 to November 2004. The analysis reveals four regimes. The observed temporal pattern of these regimes can be matched with certain political and economic events in Ukraine. In particular, we find a strong link between the 'high uncertainty' regime and discretionary policy interventions in 2003.
Tipo: Conference Paper or Presentation Palavras-chave: Markov-switching vector error correction model; Vertical price transmission; Regime shifts; Grain policies; Ukraine; Demand and Price Analysis; Industrial Organization; C22; Q11; Q18.
Ano: 2005 URL: http://purl.umn.edu/24624
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Rolle der agrarökonomischen Forschung für Armutsbekämpfung in Entwicklungsländern AgEcon
Brümmer, Bernhard; von Cramon-Taubadel, Stephan; Qaim, Matin.
Tipo: Journal Article Palavras-chave: Food Security and Poverty; International Development.
Ano: 2008 URL: http://purl.umn.edu/97698
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Die Gemeinsame Agrarpolitik der EU: Die Wirkungen von Direktzahlungen aus entwicklungspolitischer Perspektive AgEcon
Brümmer, Bernhard; Fahlbusch, Markus.
In der Diskussion über die Fortführung der Gemeinsamen Agrarpolitik nach 2014 spielen die entkoppelten Direktzahlungen eine dominierende Rolle. Während sich die Debatte innerhalb der EU vor allem um die langfristige Begründung solcher Direktzahlungen dreht, steht aus Sicht der internationalen Handelspartner stärker die Frage im Vordergrund, inwieweit von den formal entkoppelten Zahlungen nicht doch Produktions- und damit Handelswirkungen ausgehen. Vor diesem Hintergrund werden in der vorliegenden Studie zunächst die theoretischen Wirkungen, die von formal entkoppelten Direktzahlungen auf die Erzeugung von Agrargütern ausgehen können, erörtert. Anschließend wird mit Hilfe einer empirischen Analyse der Handelsströme bei ausgewählten Agrarprodukten im Export...
Tipo: Working Paper Palavras-chave: Handelsanalyse; Politikfolgenabschätzung; Agricultural and Food Policy; Food Security and Poverty; International Development; International Relations/Trade; F-13; F-14; Q-11; Q-13; Q-17; Q-18.
Ano: 2012 URL: http://purl.umn.edu/123355
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A Note on Technical Efficiency, Productivity Growth and Competitiveness AgEcon
Nivievskyi, Oleg; Brümmer, Bernhard; von Cramon-Taubadel, Stephan.
‘Productivity and efficiency growth enhances competitiveness’. Similarly formulated statements are common in the literature on the economic performance of firms, industries and nations. This conventional perception in the economic literature, originating from trade and growth theory models, however, lacks a clearly defined mathematical formulation. Earlier work by Page (1980) and Nishimizu and Page (1986) provides an elegant formalization of the relationship between the productivity growth and competitiveness measured by the Domestic Resource Costs (DRC) ratio. However, the relationship between technical efficiency and competitiveness has not been addressed in the literature. Moreover, the DRC is a biased measure of competitiveness. We propose static and...
Tipo: Conference Paper or Presentation Palavras-chave: Agribusiness.
Ano: 2010 URL: http://purl.umn.edu/61759
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Policy Reform and Productivity Change in Chinese Agriculture: A Distance Function Approach AgEcon
Brümmer, Bernhard; Glauben, Thomas; Lu, Wencong C..
Agricultural policy reform has been an important source of change in the Chinese agricultural sector. The reforms led to productivity growth and helped China in pursuing its self-sufficiency goal especially in the grain sector. To analyse whether observable productivity growth stems from technologically induced components, or from the market induced parts, a multi-input-multi-output model is derived using an econometric distance function framework. A decomposition allows to distinguish allocative effects, scale effects, technological change, and technical efficiency change. Data on farms in Zhejiang from 1986 to 1999 are used to analyse the impact of policy reform.
Tipo: Conference Paper or Presentation Palavras-chave: Productivity growth; China; Policy reform; Distance function; Productivity Analysis.
Ano: 2002 URL: http://purl.umn.edu/24779
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Institutional Changes for Agricultural and Rural Development in the CEEC and CIS Region AgEcon
Koester, Ulrich; Brümmer, Bernhard.
The paper emphasizes the importance of embedded institutions for the transformation of the agricultural sector and rural economies in the transition countries and identifies and analyses institutional aspects regarding agriculture and rural development common to the transition countries. It focuses on the institutional dimension of reform policies, i.e. on the political economy aspects of the transition process that were decisive for the success or failure of the reforms. The importance of identifying the “mental models” of various stakeholders during the transition process is emphasized and the reasons are explored why the transition process in the countries of Central and Eastern Europe has not resulted in a restructuring of the agricultural sector...
Tipo: Journal Article Palavras-chave: Transition countries; Agriculture; Agricultural reform; Agricultural policy; Rural development; Farm structure; Institutions; Community/Rural/Urban Development; International Development.
Ano: 2006 URL: http://purl.umn.edu/112605
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Impacts of environmental regulations on the efficiency of arable farms in France and Germany AgEcon
Piot-Lepetit, Isabelle; Brümmer, Bernhard; Kleinhanss, Werner.
This paper develops a methodology for asymmetric treatment of desirable and undesirable outputs. First, a hyperbolic output efficiency measurement is used to describe a middle term transformation of production processes where producers try to improve their competitiveness together with a reduction of the negative impact on the environment. Second, a radial efficiency measurement, called directional output distance function, is used to depict a long-term transformation of the production process. A non-parametric Data Envelopment Analysis (DEA) and a Stochastic Frontier Analysis (SFA) are used to evaluate the impact of agricultural policy changes, both in France and Germany, on the technical and environmental efficiency of arable farms, taking into account...
Tipo: Journal Article Palavras-chave: Frontier analysis; Technical and environmental efficiency; Environmental regulations; Agricultural and Food Policy; Environmental Economics and Policy; Productivity Analysis.
Ano: 2001 URL: http://purl.umn.edu/98867
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Farmer Participation in Supermarket Channels, Production Technology, and Efficiency: The Case of Vegetables in Kenya AgEcon
Rao, Elizaphan J.O.; Brümmer, Bernhard; Qaim, Matin.
Supermarkets are gaining ground in the agri-food systems of many developing countries. While recent research has analyzed income effects in the small farm sector, impacts on productivity and efficiency have hardly been studied. We use a meta-frontier approach and combine this with propensity score matching to estimate treatment effects among vegetable farmers in Kenya. Participation in supermarket channels increases farm productivity in terms of meta-technology ratios by 45%. We also find positive and significant impacts on technical efficiency and scale efficiency. Supermarket expansion therefore presents opportunities for agricultural growth in the small farm sector, which is crucial for poverty reduction in Africa.
Tipo: Working or Discussion Paper Palavras-chave: Supermarkets; Technical efficiency; Scale efficiency; Meta-frontier; Meta-technology ratio; Sample selection; Kenya; International Development; Marketing; Production Economics; Productivity Analysis; D24; L23; O12; Q12; Q16.
Ano: 2011 URL: http://purl.umn.edu/113508
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Bestimmung der Determinanten der Rapspreisentwicklung in der Hochpreisphase auf Basis von Markovzeitreihenmodellen AgEcon
Busse, Stefan; Brümmer, Bernhard.
Der Einfluss der Entwicklungen auf verschiedenen Agrarmärkten auf den deutschen Rapsmarkt wird im vorliegenden Beitrag anhand von multivariaten Zeitreihenmodellen für die Produktpreise untersucht. Da sich in Hochpreisphasen die Preisanpassungsprozesse möglicherweise im Vergleich zu Phasen niedriger Preise ändern, wird auf ein nichtlineares Vektor-Fehlerkorrektur-Modell (VFKM) zurückgegriffen, das regimeabhängige Anpassungen zulässt. Die Spezifikation des Modells als Markovsprung-VFKM (MS-VFKM) erweist sich hier als vorteilhaft, da es keiner a priori Regimespezifizierung und -abgrenzung bedarf. Die Analyse zeigt, dass in den Jahren 2007/08 signifikante Änderungen in den Anpassungsprozessen der Rapspreise im Verhältnis zu anderen Agrargütern auftraten, wobei...
Tipo: Conference Paper or Presentation Palavras-chave: Markovsprung-Vektor-Fehlerkorrektur-Modell; Regimeabhängiges Verhalten; Rapsmarkt; Hochpreisphase; Research Methods/ Statistical Methods.
Ano: 2009 URL: http://purl.umn.edu/53271
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ESTIMATION ISSUES IN SINGLE COMMODITY GRAVITY TRADE MODELS AgEcon
Prehn, Soren; Brümmer, Bernhard.
Recently gravity trade models are applied to disaggregated trade data. Here many zeros are characteristic. In the presence of excess zeros usual Poisson Pseudo Maximum Likelihood (PPML) is still consistent, the variance covariance matrix however is invalid. Correct economic interpretation however requires also the last. So alternative estimators are looked for. STAUB &WINKELMANN (2010) argue that zero-inflated count data models (i.e. zero-inflated Poisson / Negative Binomial Pseudo Maximum Likelihood (ZIPPML / ZINBPML)) are no alternative since under model misspecification these estimators are inconsistent. Yet zeroinflated Poisson Quasi-Likelihood (PQL) is a reliable alternative. It is consistent even under model misspecifications and beyond that...
Tipo: Conference Paper or Presentation Palavras-chave: Gravity Model; Excess Zeros; Poisson Quasi Likelihood; Generalised Two Part Model; Gravitationsmodell; Exzess an Nullen; Poisson Quasi Likelihood; Generalisiertes Zwei-Teile Modell; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Demand and Price Analysis; Financial Economics.
Ano: 2011 URL: http://purl.umn.edu/114524
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Impacts of Export Controls On Wheat Markets During the Food Crisis 2007/2008 in Russia and Ukraine AgEcon
Goetz, Linde; Glauben, Thomas; Brümmer, Bernhard.
This paper investigates the impacts of export controls in Russia and Ukraine on wheat world market price transmission during the 2007/2008 global food crisis. Russia and Ukraine aimed to reduce wheat exports induced by extraordinarily high world market prices to secure sufficient wheat supply on the domestic markets. Utilizing a Markov-Switching vector error correction model (MSVECM), we find that the temporary export restrictions induced negative effects on wheat markets in Russia and Ukraine. Although instability increased on the world markets itself, we have shown that the increase in the market instability was particularly pronounced in Russia and Ukraine. Also, the export restrictions dampened price transmission to the farmers’ prices, which pushed...
Tipo: Conference Paper or Presentation Palavras-chave: International price transmission; Wheat market; Food crisis; Markov switching error correction model; Russia; Ukraine; Demand and Price Analysis; International Relations/Trade.
Ano: 2010 URL: http://purl.umn.edu/61626
Registros recuperados: 36
Primeira ... 12 ... Última
 

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