There's a shitty version of this already, which is welfare paid out per child. This has obvious virtues, but my friend is a section 8 landlord and has many stories over the years of this benefit being exploited as a kind of "career" which I think is not holding with the spirit of the thing.

Not a thing you can say in polite company. The prevalence of it I don't know, though, so maybe it's rare in absolute terms.

Anyway, interesting comparison to Hanson's scheme.