[felipeerias]

It would be politically impossible to implement, but I would like a daring economist to compute the exact amount that childless people should be paying as subsidies towards those with kids.

I mean, if someone's pension and social services after they retire depend on the positive externalities generated by somebody else, how much is that worth?

[sul_tasto]

indeed. social security can be rescued from insolvency by raising the withholding on those without children…