[notahacker]

Yes, old people are also an imperfect proxy for the workforce as a whole.

But this experiment which is designed to make it impossible for participants to retire off the money proves even less about people's likelihood of retiring off free money than the natural experiments where they're encouraged to do so.

[LatteLazy]

Yeah, a bigger, longer, better funded trial would be better. But we can still learn some things from this. I actually get a bit frustrated at all the too small/short/low-amount payment studies out there. But c'est la vie.