https://financialpost.com/fp-work/4-day-workweek-fix-burnout-low-productivity#:~:text=Companies%20also%20reap%20the%20benefits,increasing%20by%2022%20per%20cent.

https://cepr.org/voxeu/columns/teams-become-more-productive-when-their-hours-are-shorter

There are a couple. The basic idea is that burnout is significantly reduced, people have recovery times, less animosity towards management, just all kinds of benefits. We have the technology be so much more efficient in basically any industry and so we don’t need to be there that long even if we could handle it just fine. I could find a way to do my work twice as fast and I’d still be punished for showing up 15min later and you bet that annihilates my desire to do anything more than the bare minimum.

And, importantly, pay does not change. This isn’t a trade-off, it’s a win-win, so if they ever try to say “ok we just won’t pay you for that day” you can say “so I’ll be more productive and paid less? How does that make sense?”