That's not at all what the great-grandparent comment said. It was talking about the aggregate cost of the entire system. And the great-great-grandparent was won

That's not at all what the great-grandparent comment said. It was talking about the aggregate cost of the entire system. And the great-great-grandparent was wondering "just where is the money going to come from?" but fundamentally it's not a problem. As long as the total basic income of a country is less than the total income of a country, the latter can be redistributed into the former.