The richest 2 people in america have around 120 billion dollars between them. 100B are enough to directly give $5000 to 20M people under coupons and welfare today.Lets say you tax away that 2 trillion, which is mostly illiquid productive capacity rather than easily redistributable liquid cash. That'll provide a $7,200 basic income for about 275 million Americans for one year. Then what?
Of course, in real life, you can't redistribute Zuckerberg's wealth as cash. The most you could do is give every American a few shares of FB, a few shares of MS, etc.
Also, you won't be giving a basic income to anyone making above a certain amount (no reason to give it to someone already making several tens of thousands of dollars a year).
We already do that. It's called "welfare", not "basic income".
Not to mention that these people, unlike Warren Buffet or Trump, cannot hoard the money they get, so those get re-invested in the economy pronto.
You are confusing consumption and investment.
Buffet and Trump invest the bulk of their income. Buffet invests in railroads and insurance companies, Trump invests in condos. Peter Thiel invests his money in companies like Facebook, Linkedin and Deep Mind.
Consumption is when you spend the money on stuff like big screen TVs or food.