Regional structure of wages and external economies in Spain

Regional data on wages for the Spanish economy show that workers who live in developed regions earn more than workers in other regions. Literature on external economies provides a possible explanation of why firms do not move from these regions to others where wages are lower. Previous studies for the Spanish case use aggregated sectoral data to explain in terms of external economies why average wages are different across regions. The original contribution of this paper consists of using individual data to detect the existence and nature of external economies as an explanatory cause of territorial wage differences. With this aim, we have used individual data from the EPF 1990-91 (INE). This information permits us to control the influence of individual and job characteristics on wages to, first, detect the existence of external economies and, second, to test alternative explanations of their presence. The empirical evidence obtained confirms the relevance of territorial external economies and their influence on wages, as a result of improvements in the productive efficiency of the firm. In concrete terms, the more relevant external economies are associated with the regional human capital stock and geographical productive specialisation.regional labour markets, wages, human capital, external economies