I don't.

And that's the problem with the whole discussion: a simple, critical tipping point makes or breaks the whole proposition, and nobody can sufficiently prove which way it will tip to the satisfaction & persuasion of the sociopolitical opposition. Doesn't help that the proposition, hinging on this vapid presumption (either way), involves ENORMOUS amounts of money: "oops, we were wrong, too many people became free riders" would prove disastrous. Humans have tried a lot of socioeconomic structures, and a "play if you want to" BI model hasn't taken hold.

"Only two segments of Dauphin's labour force worked less as a result of Mincome—new mothers and teenagers. Mothers with newborns stopped working because they wanted to stay at home longer with their babies. And teenagers worked less because they weren't under as much pressure to support their families.

The end result was that they spent more time at school and more teenagers graduated. Those who continued to work were given more opportunities to choose what type of work they did."

Which isn't at all conclusive. One town, in one culture, does not mean very much in the long term. But it's enough for me to think that more experimentation is worthwhile.