Abstract
This paper extends research on industry clusters by unbundling network from cluster effects and by analysing how network effects drive the performance of cluster firms. The results show that a firm's connectedness in a regional network is positively associated with firm performance. However, we found that for cluster firms, it is even more important to build strong network positions by developing rather exclusive alliance networks. In addition, a weak position within a cluster cannot be compensated for by strong extra-regional networking activities. From this perspective, cluster-specific advantages are firm-specific and the basis for competitive advantage. Regional competitiveness is therefore a non-substitutable precondition for the overall performance of cluster firms.