Quantitative Easing

QE is a central bank buying bonds to push down long rates and add cash to the system.

In the real market

Rates hit zero during a crisis, and the central bank launches a massive QE programme, buying hundreds of billions of bonds. Mortgage rates fall, business borrowing gets cheaper, and the stock market rebounds within weeks as cash floods the system. Years later, the same central bank reverses course, shrinking its balance sheet — and markets wobble at every announcement. The scenario is QE’s double life: the invisible hand that rescued the economy during the crisis, and the withdrawal that tests it afterwards.

Using it in practice

Understand QE as a market backdrop: during QE, liquidity tends to lift risk assets; during QT, the reverse. You cannot trade the Fed’s mind, but knowing which phase the cycle is in helps set expectations for volatility.

Where people go wrong

It can lift asset prices and risk-taking, but risks inflation if overdone.

Why investors care

It is the emergency lever when rates are already near zero.

Example in numbers

Key takeaway

Quantitative easing is the emergency lever a central bank pulls when rates are already at zero: buying bonds to push long rates down and pump cash into the system. It tends to lift asset prices and ease the economy, at the risk of inflation and bubbles if kept on too long — and unwinding it (QT) can be just as disruptive. Understand QE as a market backdrop: liquidity during QE tends to lift risk assets, and its withdrawal tests them. You cannot trade the Fed’s mind, but knowing the phase helps set expectations.

Definitions reviewed by the Investing Glossary editorial team.