When I ran through this exercise several years ago, I think I made it to like 6 or 7 years before the entire thing falls down. It's not sustainable.
Given that you factored in zero economic growth, and that you made the rookie error of disregarding the UBI when calculating the income of workers, it's not surprising that you got unsustainable results.
Are you telling me that you plan to tax the UBI that is being paid to citizens via taxes?
I notice that you aren't actually doing the math, you're not actually looking at the real impacts of your plan.
Look, As a concept, UBI is fantastic. It sounds wonderful. I'd love to have it, I really would. But it's not feasible, and it's not sustainable. That's where it breaks down.
If you can actually convince me - with actual real numbers and plausible assumptions regarding the financial impact and the behavior of normal human beings (as opposed to the idealized notional ones who will work 40 hours a week for a negligible marginal income) - I'll change my tune and campaign alongside you. But you have to be able to actually deliver a competent and comprehensive analysis that demonstrates the long term sustainability of the program without using irrational assumptions.
If you can stay home and do nothing at all and get $30K... or you can work 40 hours a week for a nominal salary of $60K but you only take home $20K plus your $30K basic, for a grand total of $50K, then is that marginal $20k really worth the time investment?
Yes it is. Once you remember what the "U" stands for in UBI.
I know what it stands for. Someone saying "oh it's universal!!!!" as if that makes it magically sustainable is about as useful as "one size fits all" pants.
Essentially, for it not to be workable, your country would need to not be producing enough stuff to meet everyone's basic needs, right now. Once it passes that threshold, it's just a question of how the total productivity is divided up.
For year one, sure. For UBI to work for more than one year, you have to assume that everyone will continue to produce at the same level they did when they weren't getting free money for having been born.
That's the problem, bilby. It works great in year 1. Maybe even in year 2 and 3. But it's an exponential problem - when people start leaving the workforce, the tax rate has to rise to capture enough funds to pay the next year's UBI. And that forces more people to leave the workforce...
and it progresses at an accelerating rate. That's where the arguments in favor of UBI fall down - the proponents don't look further out than a year or two at most. They definitely aren't looking at the compounding impact of some people opting to leave the workforce. And they're definitely not looking at how that workforce flight reduces the marginal take-home income of the remaining people.
Right now, on a worldwide basis, more people suffer ill health due to eating too much than suffer due to not getting enough to eat.
That fact alone suggests that a UBI would be perfectly sustainable on a global level.
As long as people aren't stopping work to live on that oh-so-generous basic income that just provides food, clothing, and a roof over their heads, and nothing else.
Would you quit your job if you got a $30K/year income regardless? I doubt it. I certainly wouldn't. But you expect lots of other people to choose differently - why?
This year, no. If 50% of my income is taken as taxes, but I get $30K of it back, I'm still doing great. But my sister and her boyfriend would - $30K is more than they each make right now, there'd be no reason at all for them to work. They'd actually come out ahead, since they're not excluded from taxes. They'd end up with a higher effective income than they currently get. The same is true for... about a third of the people in the US. So let's assume that 50% of those are kids or retirees who aren't being taxes anyway... and you still end up with about 15% of the US workforce being better off not working at all than they are now.
Well sure, you might say... but wouldn't they want to continue working and get $35K instead of $30K? You're assuming that the desire to have a slightly better standard of living is more influential than the desire to not work at all and have 100% leisure time.
So a chunk of people are going to stop working. And that means that in year 2, it's not 50% of my income, but 55% of my income that is taken as taxes. Then it's 60%, then 70%, then 80%. My standard of living reduces with every tax increase, because my effective income gets smaller and smaller. At some point, you're asking me if I would be willing to work at my same job - which has a high degree of responsibility, accountability, and effort involved - so I can have $10K of after-tax salary plus $30K of free money? Nah. I wouldn't. At that point... probably a lot sooner than that... I can quit my job, move to the middle of nowhere and get a goat or two, take up painting, and long walks, and not have to do anything at all.
The vast majority of people would.
The only way to make UBI feasible, is to make it so low an income level that it's NOT livable. And really, at that point you're better off providing needs-based income assistance which would provide a higher overall standard of living for less cost to the government - and hence less cost to the citizens overall.