It can come from where the first $200B came from : bonds and debt. The mosquito thing in particular, you could totally say "Year N's costs will get covered in

It can come from where the first $200B came from : bonds and debt. The mosquito thing in particular, you could totally say "Year N's costs will get covered in year N+2's sales taxes" This is, of course, assuming that revenue increases. But all else being equal, inflation makes this happen