What is quantitative easing?

The short answer

Quantitative easing (QE) is a central bank's large-scale purchase of financial assets, usually government bonds or mortgage-backed securities, paid for by creating reserves. It is typically used when the policy rate is near its effective lower bound and the central bank wants to ease financial conditions further.^[1]

QE is not the same as "printing cash and handing it out." It is an asset swap: the central bank takes securities onto its balance sheet and credits the banking system with reserves.

How it works

1. The central bank buys a bond from an investor.
2. It pays by crediting the investor's bank with reserves.
3. The investor's deposit increases; the bank's reserves increase.
4. The central bank holds the bond as an asset.

The immediate effect is a change in the composition of private-sector portfolios: more reserves, fewer bonds. The broader effects depend on what investors and banks do next.

How it is supposed to help

• Lower long-term yields. By buying long-term bonds, the central bank can reduce the term premium and push investors into other assets.
• Ease financial conditions. Higher asset prices and lower yields can reduce borrowing costs and support spending.
• Signal commitment. Large purchases can signal that the central bank will keep policy accommodative.
• Restore market functioning. In a crisis, purchases can provide liquidity when markets are impaired.

What it does not do

• It does not directly force banks to lend.
• It does not directly give money to households.
• It does not guarantee inflation or growth.
• It does not eliminate the need for fiscal policy or balance-sheet repair.

The effects are indirect and depend on the state of the economy, the assets purchased, and the response of banks and investors. QE can also have distributional effects, because it tends to support asset prices.^[2]

The limits

QE is a blunt instrument. It can ease conditions at the margin, but it cannot solve a solvency crisis, a supply shock, or a broken banking system on its own. When the economy is already at full capacity, additional asset purchases may mainly affect prices and asset valuations rather than real output.

The central bank also has to manage its exit. Reducing the balance sheet — quantitative tightening — can tighten financial conditions, sometimes in ways that are hard to predict.

The bottom line

QE is a real tool with real effects, but it is not magic money. It changes the central bank's balance sheet and the composition of private portfolios. Its macroeconomic impact depends on the broader policy mix and the state of the economy.^[3]