On June 23, the U.K. will vote on whether to withdraw from the European Union. This is a momentous decision, with far-reaching economic and political consequences that are now being hotly debated. If Britons vote to exit, it could lead to a breakup of the EU, and set back the global move toward greater political integration.
This raises an intriguing question: What’s the optimal size for economic performance? Are we better off with many little competing city-states, a bunch of midsized nations or just a few big super-countries overseeing hundreds of millions of people each? If bigger is better, what about a global government?