>Retirement systems, for example, need a certain ratio of productive workers for each retiree, and I can't figure out any math that makes sense for the next ~20

>Retirement systems, for example, need a certain ratio of productive workers for each retiree, and I can't figure out any math that makes sense for the next ~20 years. Long-term systems like this are generally constantly adjusted over time to fit circumstances, and overall productivity per person is rising overall. Reframing the problem as a target quality of life vs. a target monetary amount may also help. More generally, using history as a guide, it is unwise to rely on any human organization to keep its specific long-term promises. So, ye reap what ye sow. Of course, the secret lying in plain sight is that happiness/well-being need not be a function of money at all.