1. This isn't at all obvious to me. Look at the number of people who continue working well into retirement or the people who volunteer their time. I tried sitting on my ass for three months after college and it drove me so crazy I picked up WebGL despite having zero intention of using it in my career.
2. Most UBI proposals I've seen involve replacing existing programs with UBI. My personal favorite proposal is a flat tax that's fully redistributed. There's no deficit possible here, if tax revenue goes down, so do payments.
That was an example off the top of my head. Is that the most represenative sample? Another group that doesn't need money includes doctors, lawyers, and executives in their 40s and 50s. I don't see many of them quitting the moment they're able. What do you feel the appropriate rate for the entire population is? What's the rate required to sustain society?
The only decision I intend to make (and the only one I feel qualified to make) is that I'd like to see more data. We shouldn't be making decisions off of assumptions either way.
No idea, but the low numbers still working suggest that for most people UBI would lead to a significant decrease in the amount of people working and the amount of work each person does.
2. Most UBI proposals I've seen involve replacing existing programs with UBI. My personal favorite proposal is a flat tax that's fully redistributed. There's no deficit possible here, if tax revenue goes down, so do payments.