But, you say, they’ll just go to another country. Well, the answer is not simple at all, but it is an answer (unsettlingly bordering quite close to ideology): we must work to foment socialist revolutions in the wealthiest countries, and to eradicate the profitability of exploitation the world over. Additionally, all tax havens will be encouraged–later urged, and finally coerced–to stop providing methods of tax avoidance to the rich, in exchange for continuing to maintain the presence of our onshore investment in their country. So that instead of profiting from American rich people not paying taxes, we can both mutually benefit, since all foreign investment will, at this point, be nationalized.
Okay, I’m still working out that last part.