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Heterogeneous products and tests for an appropriate aggregation level considering different qualities: evidence from fresh hake at Barcelonas wholesale market

Author

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  • Jordi Guillen
  • Ramon Franquesa

    (Universitat de Barcelona)

Abstract

This paper stresses the importance of considering an appropriate aggregation level for databases and demand analyses, as an inappropriate level may lead to biased estimates. This is illustrated by an analysis of different fresh hake products from Mercabarna, Barcelonas wholesale market. The literature on seafood demand regards hake as a single product species. Nevertheless, in the Spanish market, many types of fish, ranging from inferior to luxury goods, are marketed as hake. Our results were in accordance with empirical observations, and suggest the need for analysis at a greater depth than the species level. Thus, this questions the results of previous demand studies and most databases, which have not taken the appropriate product aggregation level into account.

Suggested Citation

  • Jordi Guillen & Ramon Franquesa, 2008. "Heterogeneous products and tests for an appropriate aggregation level considering different qualities: evidence from fresh hake at Barcelonas wholesale market," Working Papers in Economics 191, Universitat de Barcelona. Espai de Recerca en Economia.
    • Handle: RePEc:bar:bedcje:2008191
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    More about this item

    JEL classification:

    • Q22 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Renewable Resources and Conservation - - - Fishery
    • Q11 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture - - - Aggregate Supply and Demand Analysis; Prices
    • C43 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: Special Topics - - - Index Numbers and Aggregation

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