What is quantitative easing in simple terms?

The central bank creates new reserves and uses them to buy assets, mostly government bonds. That pushes bond prices up, long-term yields down, and floods the financial system with liquidity to stimulate the economy.

What is quantitative tightening (QT)?

The reverse: the central bank shrinks its balance sheet by letting bonds mature without reinvesting or by selling them. QT drains liquidity and puts upward pressure on yields.

Is QE bullish or bearish for a currency?

Generally bearish: it expands the money supply and pushes yields down, making the currency less attractive. QT is generally supportive. As always, the reaction depends on what was already priced in.

Why do central banks use QE if rates are the main tool?

QE is for when the main tool runs out. Once the policy rate is at or near zero, buying assets is one of the few ways left to ease further by pushing down long-term borrowing costs.

Glossary

Quantitative Easing (QE)

What is quantitative easing? Large-scale central bank asset purchases that inject money into the economy, typically weakening the currency; QT is the reverse.

Quantitative easing (QE) is a central bank policy of buying large amounts of assets, mostly government bonds, with newly created reserves. It is the tool banks reach for when cutting the policy rate is no longer enough. Its mirror image, quantitative tightening (QT), shrinks the balance sheet again by letting those bonds roll off or selling them.

How it works

When the central bank buys bonds, it pushes their prices up and their yields down, lowering borrowing costs across the economy well beyond the overnight policy rate. It also floods banks with reserves, easing financial conditions broadly. QT reverses the flow: liquidity drains, and long-term yields face upward pressure.

What it means for the currency

QE is usually a headwind for a currency: more supply of money, lower yields, less reason for foreign capital to stay. QT leans the other way. The cleanest effects show up between two currencies whose central banks are moving in opposite directions, one easing while the other tightens, which widens the interest rate differential in both level and expectation.

As with rate policy, the announcement moves markets more than the execution. A surprise QE program is a strongly dovish signal, and an earlier-than-expected end to QE is a hawkish one; the monthly purchases themselves are then largely priced.

Reading balance sheet policy as a trader

Watch for the turning points: hints in forward guidance that purchases will slow ("tapering"), end, or reverse into QT. Those inflection points have historically produced some of the largest and most durable currency trends, because they mark a change in regime rather than a change in degree.

A worked example

Suppose one central bank announces it will slow its bond purchases from 60 billion to 30 billion a month starting next quarter, while its neighbour keeps buying at full pace. From the announcement onward, markets treat the first bank as being on the road to higher rates: its currency starts pricing the exit, the expected rate differential shifts in its favour, and the pair between the two can trend for months. By the time purchases actually stop, most of the move has already happened. The trade lived in the announcement and the expectation, not in the mechanical execution.

The mistake to avoid

Do not read balance-sheet policy as a day-trade signal. QE and QT work slowly and are announced far in advance; their FX effect comes through the expected rate path. The practical question is always relative: which of the two central banks behind my pair is easing, which is tightening, and did anything just change that comparison?

See it in the data

Balance-sheet turns show up first in rate expectations. Track the decisions on the economic calendar and the resulting policy-rate gaps in the interest rate differential table.

Put these concepts into practice.

See how fundamental data shapes currency bias with real-time economic indicators and sentiment analysis.