Increase the inflation target to 4%, argues[1] Tim Leunig of the LSE. I’m not sure if the central banks will officially change their targets, but high inflation seems likely in the medium term regardless.
The economic puritan[2] in me is horrified by this, but lets imagine that we do need to inflate away past debts to avoid a worse crisis now. To avoid moral hazard in future borrowing considerations, we should also require by law that all future borrowings (especially government bonds) and all new savings accounts are index-linked (to RPI) in the currency in which they are denominated[3]. Remove the option of inflating away future debt, and we are less likely to get in a position where we need to do it.
[1] Dr Leunig does undermine his argument somewhat with this statement:
But central banks have far more credibility now than in the past.
I don’t have much confidence in them. Their failure is a significant cause of the mess we are in now.
[2] I’m not (much of) a social puritan: have as much fun as you like, so long as it is between consenting adults and you pay all costs in advance.
[3] Of course the transition period could be interesting, as debtors will want to stay with their old debt and its nominal interest rates, while savers in a high-inflation environment will want to shift their money to index linked accounts.