But inefficiencies scale up super-linearly. The USA, for instance, has less cultural cohesion and sense of national identity than Estonia (the Russian minority

But inefficiencies scale up super-linearly. The USA, for instance, has less cultural cohesion and sense of national identity than Estonia (the Russian minority in Estonia being the exception that perhaps proves the rule). Additionally, larger countries necessarily have more layers of bureaucracy, which make national programs more difficult to implement (the USA still does not have a national identification card, though I think RealID is still going forward, largely because of resistance on the part of states).