This is what Keynes predicted might happen - https://onlinelibrary.wiley.com/doi/full/10.1111/ecca.12439#... That article notes most people can't make enough money from 15 hours of work to save up for retirement. I also wonder if "leisure" has to be redefined, since work and life blend so much online. What does 15 hours of work really mean in a knowledge work job?
For me and I think in the past leisure did not mean mindlesly doing something like nothing, it meant time after misery is gone. I see it as working necessary time at work that you likely do not want to do, like at a factory assembly line or farm, hospital, etc. After that, you can stay at work, but do something else, like engineering at that factory or what else there is you would like to do. This mean less working h…
You learn much more if you start young and keeping the expertice on the floor longer would also help.
If we reserve the younglings earnings for specific purchases productivity would increase even more.