They have the money to provide for them to a standard higher than modern western countries, not just to an 18th c subsistence level. Also those money examples a

They have the money to provide for them to a standard higher than modern western countries, not just to an 18th c subsistence level. Also those money examples are minor details against the backdrop of poorer countries having more kids, and poorer generations in Japan having more kids (in the 4x region). What they lack is the will. That's not a judgement: if everyone's privately ok with the situation, e.g. letting the population steadily decline in hope a natural equilibrium point will be reached, that's one thing. But collectively lying about the situation and its causes is another. Otherwise, prioritisation (e.g. having hours of unnecessary meetings versus just go home) would fix the problem automatically steadily over time.