Those projections assume Chinese birth rates stay constant but Chinese birth rates are crashing year after year. It’ll almost certainly be worse than expected at this rate.Because with even the most doomest trajection we are still talking about a china with like 800~1000 million citizens in 2100 if I'm not mistaken.
In 2050 China will still be 3.5 times the US, in 2100 China still be around double the US in population numbers. This is without taking in account of black swan events like de-dollarization, growth of global south. What happens with US numbers when global citizens don't want to migrate to the US anymore? Because the dollar went from king dollar to one of the pleb coins. The economics is not worth being seperated from family.
Then you also have to look at the US vassals in the neighborhood of China like south Korea and Japan both are also declining in population numbers and economic might.
China demographic problem will be more of a government budget problem as long as chinese people continue innovating in tech they will be secure.
Not saying they should stop fixing this it's still a problem that needs to be solved.
Also the count of people isn’t as important as the structure; if you have 1 billion people but 70% of them are old people you’re not competitive with younger societies because old people neither consume nor produce at the level of younger people.
Old people also need more societal support. Which means much more spending on health care and nursing instead of manufacturing and industry. Productivity will drop like a rock just look at Japan.
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