What source? The US birth rate was absolutely not steady from 1990 to 2010 according to the OECD [0]. Fear mongering aside, surely the prospect of a population failing to birth enough new lives to replace the ones that die, as happened in France last year, seems like a bad thing for a capitalist system that depends on growth uber alles. AI and efficiency be damned, fewer people buy fewer things.

0: https://www.oecd.org/en/publications/society-at-a-glance-202...