In a previous paper, Delgado, Fariñas and Ruano (2002) report TFP differences between exporters and non-exporters on the basis of a sample of Spanish manufacturing firms. In this paper, we extend the previous analysis in three directions using a similar data set. First, we investigate additional economic performance differences between exporters and non-exporters. Second, we measure TFP differences estimating production functions that control for unobserved heterogeneity and simultaneity bias. Third, we explore the self-selection and learning-by-exporting hypothesis as explanations for the greater performance of exporters. With respect to the results, we confirm that many indicators of economic performance such as productivity, size, wages and innovation are greater in exporting firms. Furthermore, TFP differences between exporters and non-exporters estimated with parametric methods are remarkably similar to those estimated using index numbers. Finally, performance differences and transition patterns between the export market and the domestic market indicate higher performance for entering exporters with respect to non-exporters at the moment of entry. We find evidence of selection in the entry and the exit side of the export market. One of the basic results that we obtain indicates that after controlling for self-selection, the productivity growth of entering exporters does not significantly change with respect to non-exporters. As the evidence we find indicates no systematic changes in performance between non-exporters and exporters after entry takes place, we do not confirm the learning-by-exporting hypothesis. Copyright 2007 The Authors Journal compilation Blackwell Publishing Ltd. 2007 .
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