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If higher birth rates means greater economic development, isn't the solution then for Europe and the US to have large amount of immigration from higher-birthrate continents? causality there is definitely iffie. Don't think the jury is out on that yet.
But yes, as a matter of patching over fiscal and retirement systems during this demographic chaos, yes, that is the answer. (but few people in Western countries want that, so... square that circle for me).