But I'm not sure that 40hrs is the sweet spot. Other countries have chosen differently (with comparisons difficult to draw).
There are several competing influences here: inflation, AI productivity gains (TBD but nonzero), existing legislation around health insurance obligations, social/economic inertia, etc. And definitely others I'm not smart enough to think of!
It'd be interesting, if it was possible, to ramp down the 40hrs by an hour or two every year, keeping other components (esp healthcare) in step, to see where the inflection point is. I feel confident that we could get down to 32hrs without major negative drama. I agree that 18hrs (suggested elsewhere) would be violent.
Some “it takes a village” type of mentoring for children. Or programs to spend time with the elderly. Get outside and get involved in public works projects like repairing parks and waterways.
Total fantasy, for sure, but that’s what revolutionary new tech like AI could actually benefit society by letting humans be more human.