What is quantitative easing?

How central banks expand their balance sheets — and why it matters.

TL;DR

Quantitative easing (QE) is when a central bank creates new money to buy government bonds and other assets, lowering long-term rates and injecting liquidity. Heavy artillery for fighting deflation and recessions.

Mechanics

The Fed creates bank reserves (digital ledger entries) and uses them to buy Treasuries and MBS from banks. Banks now have cash instead of bonds; bond yields fall as demand rises. Lower long-end rates flow through to mortgages, corporate borrowing, asset prices.

When central banks use it

Deployed when the short-term rate is already near zero. Used in 2008–2014, 2020–2022, and Japan continuously since the late 1990s.

QT — the reverse

Quantitative tightening lets bonds mature without replacing them, draining liquidity. Balance sheet shrinks, long-end yields rise. Used 2017–2019 and 2022–present.

Worked example

The 2020 COVID QE

Fed responds to the COVID crash.

1March 2020Cut rates to 0; announced unlimited QE
2Balance sheet$4.2T → $7.0T in 3 months
310Y yield1.9% → 0.5%
4EquitiesS&P +60% in 6 months
5Mortgages30Y rate to 2.65%
6Side effectM2 grew ~25% — fed into 2022 inflation

Takeaway

QE works fast in financial markets but takes longer to show in inflation. The 2020–2021 wave drove both the 2021 rally and 2022 inflation.

Common mistakes

What to avoid

!Confusing QE with 'printing money for government spending' — it's bank reserves, not currency in circulation
!Assuming QE always causes inflation — Japan ran QE for 20+ years with deflation
!Treating QE as a guaranteed equity rally signal
!Ignoring the QE-to-inflation lag

Self-check

Test yourself

Q1What does QE do to interest rates?+

Lowers long-term yields by creating massive demand for long-dated bonds.

Q2Difference between QE and direct money-printing for government?+

QE creates bank reserves to buy bonds; it doesn't put currency directly into circulation or the government's hands.

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