so the company will keep all its employees it requires

Is that not the case now? Companies only have the staff the require at any time, no? So if hours get cut, they cut staff, no? I'm all for reducing work weeks to 4 days, it honestly won't bother me even if I take a pay cut, I make enough right now so a pay cut won't hurt me. I'm just wondering how in the world is my employer going to feel incentivized to pay me more an hour to work fewer hours. Let's say I make $100/hour (I don't). I work 40 hours a week. $4000 a week, cool. Now a law happens: I can only work 32 hours for full time and more than that is overtime. I'm still making $100/hr, no? Okay, $3200 a week. That's fine and dandy if you make that much, but I'm just wondering how that helps people who make minimum wage and whatnot. They can just keep working 5 days, overtime now, to keep up their bills while I, a person who makes more than them, get to enjoy the sweat off of their back on my off day?

This already happens with weekends: poor people work them, not the rich. It's not a zero sum thing, but I'd absolutely prefer a solid UBI plan than a 32 hour work week. With a UBI, a 32 hour work week can just happen naturally as people work less. Either way, I'm just have way more questions with a 32 hour work week than a UBI, and a UBI can get much better support than a 4 day work week honestly.