The money charged for the public goods can go to public maintenance, and whatever isn't used there, can be paid out again by the govt as part of paying the UBI. you're recycling money, using it as an information-carrier. That's how it's supposed to work, to direct resources where they're needed. If you started charging for public goods you'd triple or quadruple the GDP, but to keep the consumption constant you'd need a lot more money circulation... ie the UBI
HistoPol