maggie: It wouldn't add to the debt immediately because the govt has already effectively borowed to get the cash to pay you for your loan income anyway. It would mean it was written off putting the budgets into a massive deficit, which financial markets do not like. $15b is a huge sum, especially considering the projected surplus this year BEFORE super fund contributions is now $600m I think.
Cue credit rating downgrade (multiple ratings I reckon, with $15b of write-offs), much more expensive borrowing, withdrawal of capital from NZ markets due to increased risk premium on NZ investments.... it can all roll up into a big ball and keep getting bigger....
But anyway, it's all ridiculously hypothetical, and it would give all the wrong signals to borrowers! (no, you don't REALLY have to pay it back) What kind of ethic is that?
Eight years at uni! *gasps* What the hell were you doing!? *grin*