At my old job i switched to 4 days a week. I'm pretty sure I got more work done overall and only got paid 80% for it. It should be a no brainer for employers
If it's just a few companies doing it the 20% cut means you will probably lose many of the top performers, especially the younger ones who are more willing and able to put in more effort for more money. If it's most companies doing it then you'll probably see an overall drop in morale and those top performers or people who'd rather have the 100% might actually deliver even less than the 80%. Keep in mind that the costs of living don't go down proportionally, if anything some bills might even go up after spending that extra day in your own home.
