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Wie sensibel reagieren deutsche Verbraucher auf Preisänderungen bei Bio-Eiern? Eine Nachfrageanalyse mit Haushaltspanel-Daten

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  • Schroeck, Rebecca
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    Abstract

    Die Studie analysiert die Nachfrage nach Eiern aus konventioneller und ökologischer Erzeugung in Deutschland auf der Basis von Daten des Haushaltspanels der Gesellschaft für Konsumforschung (GfK) für frische Lebensmittel. Die Datengrundlage ist in ihrer Größe und ihrem Informationsgehalt einzigartig, da sie Einkäufe von mehr als 13.000 Haushalten über einen Fünfjahreszeitraum abbildet. Es wird eine zweistufiges Schätzverfahren angewandt. Im ersten Schritt wird mit einer Probit- Analyse untersucht, welche Faktoren die Kaufwahrscheinlichkeit für die untersuchten Eiersorten beeinflussen. Im zweiten Schritt liefert die Schätzung eines Linear Approximated Almost Ideal Demand Systems (LA/AIDS) detaillierte Preis- und Ausgabenelastizitäten. Dabei berücksichtigt die Studie die Heterogenität der Haushalte, dynamische Aspekte der Nachfrage und den hohen Anteil von Nullbeobachtungen im Datensatz. Während bisherige Arbeiten stets zu dem Ergebnis kamen, dass die Nachfrage nach Bio- Produkten deutlich elastischer ist als die Nachfrage nach konventionellen Lebensmitteln, ermittelt die vorgestellte Studie für Deutschland eine unelastische Nachfrage sowohl für konventionelle als auch für Bio-Eier. Außerdem zeigt sich, dass die Preissensibilität der Verbraucher bei Bio-Eiern mit zunehmender Marktreife des Bio-Marktes abgenommen hat. This paper provides price and expenditure elasticity estimates for organic and conventional eggs. The analysis is based on the GfK FreshFood Scanner panel dataset which comprises purchase information as well as sociodemographic characteristics of the households. The underlying panel is a unique dataset covering grocery purchases of 13,000 households over a sample period of five years. A two-step estimation procedure is applied. First, a probit regression examines which household characteristics affect the probability to buy organic and conventional eggs. Second, a Linear Approximated Almost Ideal Demand System (LA/AIDS) provides detailed demand elasticity estimates. Thereby, the study accounts for sociodemographic heterogeneity of households as well as for dynamic aspects of demand and for censoring. While in previous studies the demand for organic food was found to be highly elastic, the present analysis suggests that in Germany price elasticities for conventional as well as for organic eggs move in the range of unity. Furthermore, price responsiveness of organic consumers declines over time.

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    Bibliographic Info

    Paper provided by German Association of Agricultural Economists (GEWISOLA) in its series 51st Annual Conference, Halle, Germany, September 28-30, 2011 with number 114492.

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    Date of creation: 2011
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    Handle: RePEc:ags:gewi11:114492

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    Keywords: Bio-Eier; Haushaltspanel; LA/AIDS; Preiselastizitäten; Deutschland; Organic eggs; Household Panel; Price elasticities; Germany; Agribusiness; Demand and Price Analysis;

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    1. Zepeda, Lydia & Li, Jinghan, 2007. "Characteristics of Organic Food Shoppers," Journal of Agricultural and Applied Economics, Southern Agricultural Economics Association, vol. 39(01), April.
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    3. J. Scott Shonkwiler & Steven T. Yen, 1999. "Two-Step Estimation of a Censored System of Equations," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 81(4), pages 972-982.
    4. Hassan, Daniel & Monier-Dilhan, Sylvette & Nichele, Veronique & Simioni, Michel, 2009. "Organic Food Consumption Patterns in France," 2009 Pre-Conference Workshop, August 16, 2009, Diet and Obesity: Role of Prices and Policies 53342, International Association of Agricultural Economists.
    5. Faical Akaichi & Rodolfo M. Nayga, Jr & José M. Gil, 2012. "Assessing Consumers’ Willingness to Pay for Different Units of Organic Milk: Evidence from Multiunit Auctions," Canadian Journal of Agricultural Economics/Revue canadienne d'agroeconomie, Canadian Agricultural Economics Society/Societe canadienne d'agroeconomie, vol. 60(4), pages 469-494, December.
    6. Breusch, Trevor S & Wickens, Michael R, 1987. "Dynamic Specification, the Long Run and the Estimation of Transformed Regression Models," CEPR Discussion Papers 154, C.E.P.R. Discussion Papers.
    7. Deaton, Angus S & Muellbauer, John, 1980. "An Almost Ideal Demand System," American Economic Review, American Economic Association, vol. 70(3), pages 312-26, June.
    8. Monier Sylvette & Hassan Daniel & Nichèle Véronique & Simioni Michel, 2009. "Organic Food Consumption Patterns," Journal of Agricultural & Food Industrial Organization, De Gruyter, vol. 7(2), pages 1-25, December.
    9. Glaser, Lewrene K. & Thompson, Gary D., 2000. "Demand For Organic And Conventional Beverage Milk," 2000 Annual Meeting, June 29-July 1, 2000, Vancouver, British Columbia 36346, Western Agricultural Economics Association.
    10. Astrid Jonas & Jutta Roosen, 2008. "Demand for milk labels in Germany: organic milk, conventional brands, and retail labels," Agribusiness, John Wiley & Sons, Ltd., vol. 24(2), pages 192-206.
    11. Moschini, Giancarlo & Moro, Daniele, 1996. "Structural Change and Demand Analysis: A Cursory Review," European Review of Agricultural Economics, Foundation for the European Review of Agricultural Economics, vol. 23(3), pages 239-61.
    12. Frykblom, Peter, 1997. "Hypothetical Question Modes and Real Willingness to Pay," Journal of Environmental Economics and Management, Elsevier, vol. 34(3), pages 275-287, November.
    13. Gary D. Thompson, 1998. "Consumer Demand for Organic Foods: What We Know and What We Need to Know," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 80(5), pages 1113-1118.
    14. Huang, Chung L, 1996. "Consumer Preferences and Attitudes towards Organically Grown Produce," European Review of Agricultural Economics, Foundation for the European Review of Agricultural Economics, vol. 23(3), pages 331-42.
    15. Smith, Travis A. & Huang, Chung L. & Lin, Biing-Hwan, 2009. "Does Price or Income Affect Organic Choice? Analysis of U.S. Fresh Produce Users," Journal of Agricultural and Applied Economics, Southern Agricultural Economics Association, vol. 41(03), December.
    16. Glaser, Lewrene K. & Thompson, Gary D., 1999. "Demand For Organic And Conventional Frozen Vegetables," 1999 Annual meeting, August 8-11, Nashville, TN 21583, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
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