[beAbU]

I would hope that my own current contribution to the fiscus would pay for my eventual old age pension. And my hypothetical children's future contribution would pay for their own retirement. But alas this is probably not the case.

[ndriscoll]

It couldn't possibly be the case. The only way that could make sense is if your contribution were paying for something like automation of the services you will one day need. Otherwise, at the end of the day, the services you'll need will require labor, and if there's insufficient labor available because not enough people had kids, then the amount of money you contribute today is irrelevant, and it's ultimately unfair to expect a future generation to devote most of their available resources to taking care of a previous generation.

Money is a grease to help direct resource utilization. You can't expect the big bucket of grease you saved for the future to mean much if there are no resources to flow. You cannot rely on a financial abstraction to "invest" in the future without everyone also actually concretely investing in creating a future.