It's also a circular negative feedback loop until it gets balanced out. Imo, below replacement birthrates can be thought of as "getting worse", but they're skew

It's also a circular negative feedback loop until it gets balanced out. Imo, below replacement birthrates can be thought of as "getting worse", but they're skewed by a narrow window of immense prosperity and wealth that was basically fabricated, and could thus be the rebalancing, of governments let them. Less prosperity for a whole generation of people that effectively make up the future market for overvalued static assets, means there is hypothetically a ceiling, likewise if the population is only inflated by economically low-value immigration; if systems are working,(they're not) then there simply won't be enough domestic money flowing around to keep supporting that type of hockey stick growth. That's my theory anyway