Principles of subsidarity like sovereignty (a concept that is, in my opinion, not well understood despite claims to the contrary at any political division of "nation-state") recurs here in discussion of secession politics, EU budget, immigration, transnational listings, regulatory and "cohesion" franchise operations, and so forth. Both ideals are always in the background of currency and debt debates. EU is usually in the foreground of inter-state conflicts, paradoxically. Consider for example lurid coverage of the latest sovereigns' opposition to Don Brussels.

Nine countries unite against EU export controls on surveillance software

Diversity is the key to economic and political evolution.