Abstract
The objective of this paper is to study, following a primal approach, the technical efficiency of a sample of boats which catch hake in Asturias. In this activity the catches of species different from hake are important. The multiproduct nature of this activity raises different modelling alternatives. In this paper we compare the results obtained in the estimation of an aggregate production function, a multiproduct production function, and a distance function. The three models are estimated using the within-groups estimator. After eliminating the influence of time invariant variables, the efficiency indexes are calculated in a second stage using the individual fixed effects. The empirical analysis uses a panel data set of eleven boats in 1999.
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