What Are Bond Vigilantes — The Penalty the Market Charges the Government

Bond vigilantes is an expression for bond investors who sell a country's government bonds when they judge its fiscal policy or inflation to be excessive.

Selling government bonds pushes their prices down and, to that extent, pushes interest rates (the government's borrowing cost) up. In other words, the market sends the signal that 'your policy is dangerous' in the form of rising rates. Because the market, not an election, forces discipline on the government, they are called 'vigilantes' (people who keep order themselves).

In September 2022, U.K. Prime Minister Liz Truss announced large tax cuts (about £50 billion) without a funding plan. Bond investors, seeing this as likely to widen the fiscal deficit and inflation, sold U.K. government bonds (gilts) heavily.

As a result, gilt yields surged about 2 percentage points in a matter of days, and as related markets such as pensions were shaken, the Bank of England stepped in with an emergency intervention. Truss ultimately reversed most of the policies and resigned after just 45 days in office. It was a symbolic event in which the bond market changed a nation's policy and its government.

The bond vigilante concept shows that 'government bond yields reflect a country's fiscal credibility.' If finances look profligate or inflation management looks likely to fail, the market pushes rates up first as a warning.

For investors, this means you can read movements in government bond yields as 'the market's assessment of government policy.' That said, no one can predict where and when such an event will occur, so rather than concentrating on a particular country or currency, it is realistic to prepare with diversification.