In discussions of the regionalization of competition law, the political dimension often leads a shadowy existence. Regionalization tends to be presented with a hint of a halo around it. States are presented as acting for a shared policy objective intended to benefit all, and political issues...

We examine the impact of (and links between) two types of economic integration on the stability of multimarket collusion when firms interact in quantities in segmented markets: (1) multilateral trade liberalization, captured by a reduction of trade costs across all markets; and (2) preferential...