At the other end, governments can force down bond yields. Central banks can print money and use it to buy government bonds, which forces down bond yields. This is known as quantitative easing, and is something the US Federal Reserve and the Bank of England have done to the tune of about US$2 trillion since 2008.
For politicians, this strategy is much more attractive than an almightly day of reckoning whereby debt is restructured, bank shareholders are wiped out and bond-holders are forced to turn their bonds into shares. The drama convulsing bond markets in Europe is an example of this.
The debate about whether to use financial repression or to allow a debt restructure often pits richer and more powerful special interests against the poorer public. This also pits an older generation of rich savers against a younger generation of borrowers.
The two sides have to agree on how much debt needs to be written off. That is the predicament facing Europe and the US. How do they make the debt go away without crashing the system?
The simplest way is financial repression, and this is the solution the grown-ups of the economics world have chosen. Ultimately though, a timid period of inflation above interest rates may not be enough to wipe away debts ranging from 300-900 per cent of GDP in the US and Europe.
The way to reset the global economy is a huge and immediate dose of inflation. It would wipe out a lot of older people's savings, but in a way that doesn't wipe out the economy. It may be the only way out the young will accept - if only they could vote for it.