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This paper investigates how technological distance between firms affects their network of R&D alliances. The theoretic model assumes that the benefit of an alliance between two firms is given by their technological distance. This benefit-distance relationship determines the ego-network of each firm as well as the overall network structure. Empirical relevance is confirmed for the bio-pharmaceutical industry. Although the authors find that the network structure is largely explained by firm size, technological distance determines the positioning of firms in the network.
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