Firstly, this probably isn't correct, see this recent report from Finland: https://twitter.com/rcbregman/status/1258336749828419584
I'd also point out that the current situation forces an "all or nothing" employment system. In Aus, if you're working part time you don't quality for any benefits, so the incentive to work while on unemployment is lowered. However, with UBI, there _is_ incentive to work. You can double your income by taking up a part time job, instead of getting the same amount from working as you would from unemployment.
I'd also challenge you and say why do think reduced working hours is a bad thing?
Also, what about all the people with a lot of money who don't work?
All your arguments have been made before and discussed in depth.
> The problem being that our economy depends on these people performing such jobs.
The economy should serve the people. Shareholders may depend on it though :)
Your "inflationary spiral" theory is also unfounded, and has been shown previously.
> Why work overtime at McDonalds when your rent is already paid up for the month and there are so many fun video games to play?
This is a terrible strawman, but also maybe MCD should pay better or offer other incentives? They're not owed employees.