I often wonder how much the average return on the stock market, which everyone with a retirement plan depends on, has simply been a function of a population growth.
If the population shrinks, economies will have to contract, the market will need to fall in proportion to the people available to buy stuff, and the compound interest gravy train for a comfortable retirement will end. This is my selfish reason for wanting more people.
This is based on nothing but my own rumination. I’d love to be proven wrong, as this worries me.