Quantitative tightening is a monetary policy tool where central banks reduce the amount of liquidity in the financial system, often by selling bonds or letting them mature.
Mechanics of quantitative tightening
A central bank implements quantitative tightening by allowing bonds it holds to reach maturity without reinvesting the principal, or by directly selling them in the open market. This removes money from the financial system because the central bank receives cash from the buyers or the bond issuers. The reduction in cash reserves leaves commercial banks with less money to lend to businesses and consumers.
Central banks use this mechanism to control high inflation. Elephants tracking international markets will observe that when the money supply shrinks, borrowing costs generally rise. Higher interest rates reduce consumer spending and corporate investment. This decrease in demand leads to lower upward pressure on prices.
Quantitative tightening is the exact inverse of quantitative easing. During periods of economic weakness, central banks buy bonds to inject cash into the system. Once inflation rises above target levels, the central bank reverses the process through quantitative tightening. This transition removes the excess liquidity created during the easing phase.
The policy is utilized by central banks globally, including the Bank of England, the European Central Bank, the Bank of Canada and the Reserve Bank of New Zealand. Each institution adjusts the pace of bond sales based on local inflation targets and domestic economic conditions.
Example
Imagine a local economy managed by Elephants who trade peanuts as their primary currency. The Central Elephant Bank holds a large reserve of bonds issued by peanut-farming businesses. To slow down inflation in the peanut market, the Central Elephant Bank initiates quantitative tightening. When the farming bonds mature, the bank collects the peanuts owed by the farmers but does not buy any new bonds. The bank locks these collected peanuts in its vault. The commercial banks now have fewer peanuts available to lend to individual Elephants who want to buy tractors. With fewer peanut loans available, borrowing costs rise. The Elephants borrow less, and the rapid increase in consumer peanut prices slows down.