What triggers the information exchange among the regional offices in Brussels? To answer this question, we develop a framework based on network theory and present the first large-N quantitative study on European Union-level inter-regional networks. Our results show that information exchanges take place predominantly among regions from the same member state. Furthermore, the likelihood of regular information exchanges between two regional offices depends on the resources invested in regional representation, the joint involvement in inter-regional associations, and geographical proximity. In contrast to our expectations, our findings refute the hypotheses that more regional autonomy and more experience in Brussels increase the propensity toward cross-border inter-regional networking, a practice that might potentially contribute to the fragmentation of member state representation.
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