It’s not as simple as “just multiplying”, though.. You don’t just give everyone $X dollars. If you make $100,000 per year, you don’t get anything. But if you make below a certain amount, say $10,000, then you pay a negative income tax, which means you get some money.

Also I don’t know which version of libertarian you’re using, but I don’t think I’d classify libertarians as being super supportive of UBI...