My view is we would get it if we had not just a few hundred countries but a few hundred thousand or even millions of ‘countries’ or territories.

Experiments like these would be commonplace, all with competing policies and rates of taxation. You could statistically measure the optimal rate.

Having as much choice for your country as you would when buying your car in the world. Governance can be better when it acts in private interests not public interests and acts more like a business, competing on the open market.