The mountain of student loan debt must surely be the bitterest legacy that Helen Clark's Government bequeathed to its political opponents after nine years in office.
Dropping interest charges in 2001 for those still studying and extending the privilege in 2005 to graduates staying in New Zealand may have seemed smart when the economy was ticking over nicely. But that was then; this is now.
The problem is that bringing an end to the scheme would be political suicide. Prime Minister John Key conceded as much when he observed in March that it was not politically sustainable to put interest back on student loans, even if he showed scant understanding of undergraduate life by adding that "it is about the only thing that will get [students] out of bed before 7 o'clock at night to vote".
But amid the wreckage of the global financial crisis and in charge of a sluggish economy, the Nats are now carrying the can for Clark's largesse. Student loan debt now stands at $12 billion - close to 10 per cent of real GDP; the opportunity costs of the scheme, by way of interest forgone in other use of the capital, rose from $385 million in the 2008 financial year to $620 million in 2010/11.
So the Budget increase that Tertiary Education Minister Steven Joyce foreshadowed this week does not seem unduly punitive: debtors will be required to pay 12 cents (up from 10) of every dollar of income over $19,084.