The second way is for debt to be restructured and for investors and bank shareholders to take losses in "haircuts". Instead, banks have mostly been bailed out by governments because of the fear that collapses would cause a depression.
The third way is for a country to inflate its way out of debt while suppressing interest rates. It's now clear that this is what the US and Europe are doing.
Japan has been holding interest rates down since the 1990s to try to keep it from sliding into depression. The Bank of Japan has set short-term rates at nearly zero per cent for almost 20 years while the state-owned Post Office and pension funds have been forced to buy government bonds with savings from an ageing population, keeping long-term rates low too.
Acclaimed US economist Carmen Reinhart says this tactic of "financial repression" was used in the 1940s to help keep interest rates low while inflation was allowed to rise above those interest rates. This reduced the real value of the debt and allowed the US government to dig itself out of debt after the Depression and World War II.
The US Federal Reserve has held its cash rate at nearly zero per cent for about three years. It has also printed more than US$1.45 trillion ($1.7 trillion) to buy US Treasury and mortgage bonds, both of which have repressed long-term rates.
Meanwhile, inflation has crept well above interest rates in both the US and in New Zealand. It's clear now that governments are comfortable with moderate inflation and don't want to (or can't) put up interest rates. That makes a floating mortgage rate attractive now.
Low rates help avoid a collapse but it means savers are being punished for the past sins of borrowers. Welcome to The Great Repression.