Self-sufficiency. Like sovereignty, self-sufficiency is not a term Trump would likely invoke at a campaign rally. But the two ideas are related. Trump doesn’t subscribe to the theory of comparative advantage among nations, or to free trade, or to economic globalization, because he believes every nation is out to get the best deal for itself even if that means breaking the rules. In that regard, the international economy is not much different from the New York real-estate market where Trump made his fortune. So rather than sacrificing his generation to a principle (as Churchill might have put it), Trump wants America to be self-sufficient in key commodities and manufactured items. That’s why he tells Apple to make its iPhones here, and Mercedes to make its cars here. He doesn’t care if that violates trade rules—and neither do most voters.