This book considers a central issue of our time: the relationship between the macroeconomic objectives of political parties in democratic countries and the legal framework of market economies. The impressive panel of contributors examines social-democratic policies on cartels, market concentration and competition in different European countries, spanning a hundred-year period (specifically the interwar period, the initial postwar period, the 1960s and 1970s, the 1980s and 1990s, and the 2000s). This thought-provoking volume challenges the dominant belief that the EU’s economic system and competition policy were mainly influenced by neoliberal economic thinking, instead showing that Keynesian and social-democratic positions played a major role in the emergence of this system. It will be valuable reading for advanced students, researchers and policymakers interested in modern economic history, industrial organization, political economy, European legal history and political science.