The chapter applies a historical institutionalist perspective to analyse the dynamics of market regulation in the European Union. It shows how an institutionalist perspective allows a deep understanding of the feedback loops that affected the preferences of European stakeholders and transformed initially insignificant agreements into profound changes that became visible only with time. Using the internal market for network industries as an example, it hows how European regulation expanded and was transformed from a very limited and often non-binding set of policies to an integrated and wide-ranging framework that sees rules for liberalisation and re-regulation of competition, together with new EU-level regulators. The long-term perspective ...