China has 4x as many people so only needs to be 1/4 as productive per capita to overtake USA
China's population is enormous. It has over four times as many people as America, and so its output per capita only needs to be about a fourth of America's to match it in total size. At this moment, that would mean a level of per capita wealth roughly equal to that in Turkey, or Brazil, or Panama, which seems entirely achievable. If China can manage Portuguese or Slovakian wealth, it will have an economy twice the size of America's.
So even if China never becomes as productive as western Europe or South Korea, to say nothing of America, it will have the world's largest economy by a healthy margin (until, that is, India catches up). And that means that China will have enormous influence in the world—will be an agenda setter—and will, in some ways, be able to marshal more real resources than America. Within Asia, China's influence will dwarf that of America. Power inevitably follows economic might, and China will soon be the mightiest.
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Exactly once in the history of the industrialised world has a dominant great power lost its status to another dominant great power, and that already tiny sample size is of limited use in informing us about the future. Britain and America shared a language, a culture, and a general political philosophy of liberalism and democracy. They were explicit friends and allies. Perhaps most important, they were both rich, in per capita terms. Chinese culture is alien to Americans, and its primary political values appear to be quite different from those of the world's current hegemon. The two countries are not enemies, but their relationship is explicitly adversarial. And while America is rich, hundreds of millions of Chinese citizens will remain extremely poor at the time China assumes the top spot in the GDP league tables.
… I think it's easy to underestimate just how unprecedented and historic a peaceful transition would be.
