What is Quantitative easing?

Quantitative easing, often shortened to QE, is a tool a central bank uses when cutting its main interest rate is no longer enough to support the economy. A central bank is the institution that manages a country's money and short-term interest rates, such as the US Federal Reserve. Under QE it creates new money electronically and uses it to buy large amounts of bonds, mostly government bonds. A bond is a loan to a government or company that pays a fixed amount of interest. The aim is to push down longer-term interest rates and make borrowing, spending and investing more attractive.

The link between bond prices and interest rates explains how this works. Say a bond pays $40 of interest a year and costs $1,000. Its yield, meaning the annual income as a share of the price, is $40 ÷ $1,000 = 4%. Now suppose heavy buying by the central bank lifts the price of that bond to $1,250. A new buyer still receives only $40 a year, so the yield falls to $40 ÷ $1,250 = 3.2%. An investor who already held $10,000 of these bonds would see their value rise to $12,500, a paper gain of $2,500, or 25%. These numbers are purely illustrative.

Lower yields on safe bonds tend to nudge savers and institutions towards other assets, such as shares, corporate bonds and property, in search of higher returns. This is why QE is often linked with rising asset prices across the board. The reverse process, in which a central bank shrinks its bond holdings, is called quantitative tightening.

A common misunderstanding is that QE means printing cash and handing it to the public. In practice the new money mostly sits as reserves, which are deposits that commercial banks hold at the central bank, and its effect on lending and everyday prices is debated. QE can also be reversed, and bond prices fall when interest rates rise. In 2022, US inflation reached about 9% and long-term Treasuries lost about 30%, a reminder that bonds bought at very low yields carry real risk.

For a private investor, QE matters because it shapes the backdrop for both shares and bonds. It can lift prices across several asset classes at the same time, which affects how diversified a portfolio really is, and it influences the income that bonds pay. Investors who understand it tend to read central bank news with more context and are less likely to treat periods of easy money as permanent.

By Dr. Harry Hamann

Is quantitative easing the same as printing money?
Partly. The central bank creates new money electronically to buy bonds, but it does not hand cash to the public. The money mostly ends up as bank reserves, so its effect on everyday prices depends on how much banks lend and people spend.

How does quantitative easing affect the stock market?
By lowering yields on safe bonds, QE tends to push investors towards riskier assets such as shares, which can support prices. The effect varies, and other forces such as company earnings, inflation and sentiment also drive markets.

What is quantitative tightening?
Quantitative tightening is the reverse of QE. The central bank reduces its bond holdings, either by selling bonds or by letting them mature without reinvesting the proceeds, which tends to put upward pressure on longer-term interest rates.