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Allowing for Group Effects When Estimating Import Demand for Source and Product Differentiated Goods AgEcon
Muhammad, Andrew.
In this study an import demand model (differential production model) is presented that is used in estimating the demand for source and product differentiated goods simultaneously. Unlike the traditional import demand models, this model can account for changes in relative group expenditures. Expenditure estimates differed when comparing the differential production model and Rotterdam model results. Results showed that if group revenue shares are relatively fixed, then the bias in expenditure estimates due to omitting group effects will be small when using traditional demand models such as the AIDS or Rotterdam models. As relative group shares significantly change and diverge the bias increases, particularly for imports representing a larger share of group...
Tipo: Conference Paper or Presentation Palavras-chave: Import demand; AIDS model; Rotterdam model; Product differentiation; Source differentiation; Demand and Price Analysis; International Relations/Trade; F17; Q17; Q11..
Ano: 2008 URL: http://purl.umn.edu/6364
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Tobit regression to estimate impact of EU market intervention in dairy sector AgEcon
Wocken, Meike; Kneib, Thomas.
This study examines the effect of European intervention politics in the European butter market in the context of market liberalization using the example of Germany. A heteroscedastic Tobit model is estimated using German butter market data from 1973-2010. There is evidence that price support has reduced price instability in the butter market. Simulation indicates that enhancing intervention price causes an increase in the expected butter price in the long-run, even though if market price is higher than intervention level. We find changing effects of stockpiling. If difference between market and intervention price is small and stock quantity is high, it significantly contributes to reducing price volatility. On the contrary if price difference is large and...
Tipo: Presentation Palavras-chave: Censored regression; Market liberalization; Butter market; Agricultural and Food Policy; Risk and Uncertainty; C5; D4; Q11..
Ano: 2012 URL: http://purl.umn.edu/122528
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Análisis de la demanda de alimentos en España considerando el impacto de la dieta sobre la salud AgEcon
Angulo, Ana Maria; Mtimet, Nadhem; Gil, Jose Maria.
RESUMEN: En este trabajo se analiza la demanda de alimentos en España considerando la relación existente entre salud y dieta. Se plantea la maximización de una función de utilidad que depende de las cantidades demandadas de los distintos alimentos y del nivel de salud alcanzado, sujeto a dos restricciones: la presupuestaria y la relativa a la función de producción de salud. La solución al problema conduce a la estimación conjunta de un sistema de ecuaciones con dos componentes, una ecuación referida a la calidad de la dieta y un sistema de demanda de alimentos. Los resultados obtenidos indican, por un lado, que la introducción de la calidad de la dieta en un sistema de demanda (frente a un modelo que incluya únicamente renta y precios) modifica las...
Tipo: Journal Article Palavras-chave: Demanda de alimentos; Salud; Calidad de la dieta; España.; Agricultural and Food Policy; D12; D13; Q11..
Ano: 2008 URL: http://purl.umn.edu/57231
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