There are all sorts of practical reasons why it's difficult to work 15 hours every week, the biggest of which is employers don't want to hire you. If you're flipping burgers, sure, but it's pretty rare to find that arrangement for a professional job.
When a robot is doing low skilled jobs and education is insanely expensive like it is now, the gap is inevitable.
Capital buys AI allowing one person to do the work of many and reap the rewards of it. America is built on this very idea.
It has the potential to kill the entire notion of wealth as we currently know it, regardless of social standing.
What then?
So yeah; let's give large numbers of people a chance to try doing what they want with their lives. Yes it will not be easy. More education will be required, some will need support to not fall into drug abuse etc but ultimately it could lead to a better human condition
The Dalai Lama puts it better than I can:
https://www.nytimes.com/2016/11/04/opinion/dalai-lama-behind...
My guess is that in additional to a basic income, you'll need to find a way to make people feel that they are needed and useful. I think it's easy for the men and women on HN, who tend to be the go-getter type to say that they would start up a business or take up painting. However I think we could all probably learn learn a little from the unemployed factory worker in Akron Ohio about what would they do with basic income, unlimited free time, but limited job prospects.
US Citizens: Couldn't find a readily available reliable source, so I'll use residents instead. Should be close enough for this math though I'd imagine this would be more likely a citizen program rather than a resident program.
US Residents: ~325 million
Federal Tax Revenue 2016 - ~3.27 trillion
Federal Tax Revenue - ~272 billion / month
Federal Tax Revenue - ~$850 / resident / month
What if we didn't give it to minors?
US residents over 18 - ~247 million
Federal Tax Revenue - ~$1100 / resident-over-18 / month
That's if we spent it all on UBI, no debt service, no federal employees, no military, no infrastructure spending, no social security, no pensions (even for federal employees who earned them and are legally and morally entitled to them), etc.
If robots don't end up making society incredibly wealthy and more unequal then there's no point in UBI to begin with. So it doesn't make sense to simply look at current figures.
Mostly it's about upbringing. People are taught to have expectations for themselves and they strive to fulfill them. 15h would be bare subsistence for most, and that's not good enough. The minute they can live their expectations without work they usually check out; e.g. 45 year old "retired" government workers bankrupting their muni/county/state with union negotiated pensions.
Do we have an actual source for this yet? Anecdotally, I still see about 7 out of every 8 deaths in my social circles occurring before 90, with a notable number before 70.
That's your view, not mine. Bankrupt governments are a fact for the both of us.