Correct - I was trying to be succinct. The idea of "sovereign debt credit ratings" is of course how it's done internationally - a nation may be unable to actua

Correct - I was trying to be succinct. The idea of "sovereign debt credit ratings" is of course how it's done internationally - a nation may be unable to actually render itself unable to default, but if it's got a 350-year history of not defaulting, that can serve as a substitute. But many organisations need loans before they've established a 350-year history, and a constitutional clause can give investors greater confidence.