Lably
Skip to content

Quantitative easing

Monetary policy tool

  • 33 min read
  • 5 chapters

Related on Lably

Through Monetary policy, Central bank and Inflation

Similar to conventional open-market operations used to implement monetary policy, a central bank implements quantitative easing by buying financial assets from commercial banks and other financial institutions, thus raising the prices of those financial assets and lowering their yield, while simultaneously increasing the money supply. However, in contrast to conventional monetary policy, quantitative easing usually involves the purchase of riskier or longer-term assets (rather than short-term government bonds) of predetermined amounts at a large scale, over a pre-determined period of time.

Central banks usually resort to quantitative easing when interest rates approach zero, such as in 2008 and 2020 for the US and in 1999 for Japan. Very low interest rates induce a liquidity trap, a situation where people prefer to hold cash or very liquid assets, given the low returns on other financial assets. This makes it difficult for interest rates to go below zero; monetary authorities may then use quantitative easing to stimulate the economy rather than trying to lower the interest rate. Quantitative easing can help bring the economy out of a recession and help ensure that inflation does not fall below the central bank's inflation target.

The term quantitative easing was coined by economist Richard Werner in 1995. Since then, it has faced a range of criticisms. Economists argue that it can inflate asset bubbles, potentially worsening a recession rather than alleviating it. Others highlight QE's mixed side effects and risks: it may overshoot its goal by countering deflation too aggressively and fueling long-term inflation, or fail to stimulate growth if banks remain reluctant to lend and borrowers hesitant to borrow. QE has also been criticized for raising financial asset prices, and thereby contributing to economic inequality. Major central banks around the world, including the US, UK, EU, and Japan, have implemented quantitative easing following the 2008 global financial crisis and again in response to the COVID-19 pandemic.

Process and benefits

Standard central bank monetary policies are usually enacted by buying or selling government bonds on the open market to reach a desired target for the interbank interest rate. However, if a recession or depression continues even when a central bank has lowered interest rates targets to nearly zero, the central bank can no longer lower interest rates — a situation known as the liquidity trap. The central bank may then attempt to stimulate the economy by implementing quantitative easing, that is, by buying financial assets without reference to interest rates. This policy is sometimes described as a last resort to stimulate the economy.

A central bank enacts quantitative easing by purchasing, regardless of interest rates, a predetermined quantity of bonds or other financial assets on financial markets from private financial institutions. This action increases the excess reserves that banks hold. The goal of this policy is to ease financial conditions, increase market liquidity, and encourage private bank lending.

Quantitative easing affects the economy through several channels:

Credit channel
By providing liquidity in the banking sector, QE makes it easier and cheaper for banks to extend loans to companies and households, thus stimulating credit growth. Additionally, if the central bank also purchases financial instruments that are riskier than government bonds (such as corporate bonds), it can also increase the price and lower the interest yield of these riskier assets.
Portfolio rebalancing
By enacting QE, the central bank withdraws an important part of the safe assets from the market onto its own balance sheet, which may result in private investors turning to other financial securities. Because of the relative lack of government bonds, investors are forced to "rebalance their portfolios" into other assets. Additionally, if the central bank also purchases financial instruments that are riskier than government bonds, it can also lower the interest yield of those assets (as those assets are more scarce in the market, and thus their prices go up correspondingly).
Exchange rate
Because it increases the money supply and lowers the yield of financial assets, QE tends to depreciate a country's exchange rates relative to other currencies, through the interest rate mechanism. Lower interest rates lead to a capital outflow from a country, thereby reducing foreign demand for a country's money, leading to a weaker currency. This increases demand for exports, and directly benefits exporters and export industries in the country.
Fiscal effect
By lowering yields on sovereign bonds, QE makes it cheaper for governments to borrow on financial markets, which may empower the government to provide fiscal stimulus to the economy. Quantitative easing can be viewed as a debt refinancing operation of the "consolidated government" (the government including the central bank), whereby the consolidated government, via the central bank, retires government debt securities and refinances them into central bank reserves.:

Proposed fiscal-monetary extensions

Imputed Tax Quantitative Easing (ITQE) is a 2026 theoretical proposal that treats the fiscal and imputed-income effects of large-scale asset purchases as objects a central bank should internalize when it designs quantitative easing, rather than as incidental side effects.

The framework maps standard QE transmission channels—portfolio rebalancing, signaling, preferred-habitat demand, fiscal space, risk-taking, and balance-sheet easing—onto System of National Accounts 2008 concepts of imputed income and imputed rental services, especially owner-occupied housing. The central bank is modeled as adding an imputed-tax adjustment term to its large-scale asset purchase rule. In the two-period household problem used in the monograph, lifetime utility is

U=u(c1)+βu(c2)

subject to an intertemporal budget constraint that includes both explicit taxes and the imputed fiscal effects of long-bond purchases:

c1+c21+r=y1−τ1+y2−τ2+(QL−QL0)BL0+ΔImputedRent1+r

Under ITQE the policy instrument is an imputed-tax adjustment written

τtITQE

which is intended to capture (i) private wealth and substitution effects from asset-price changes, (ii) extra fiscal space from lower sovereign yields and higher trend growth, and (iii) changes in imputed housing-service flows.

The proposal claims this calibration can be done inside existing Federal Reserve Act open-market authority (Section 14) and without new taxes, new agencies, or changes to published balance-sheet statistics. A two-period general-equilibrium model and a dynamic stochastic general equilibrium extension with segmented bond markets are used to argue that an ITQE-augmented rule can raise sustainable output and employment, compress term premiums, and lower debt-to-GDP paths relative to conventional QE that leaves those fiscal-like effects outside the reaction function.

As of 2026 the framework remains a self-published theoretical monograph and has not been adopted by a central bank or evaluated in the peer-reviewed monetary-policy literature that underpins the rest of this article.

Boosting asset prices: When a central bank buys government bonds from a pension fund, the pension fund, rather than hold on to this money, might invest it in financial assets, such as shares, that give it a higher return. And when demand for financial assets is high, the value of these assets increases. This makes businesses and households holding shares wealthier – making them more likely to spend more, boosting economic activity.

Signalling effect
Some economists argue that QE's main impact is due to its effect on the psychology of the markets, by signaling that the central bank will take extraordinary measures to facilitate economic recovery. For instance, it has been observed that most of the effect of QE in the Eurozone on bond yields happened between the date of the announcement of QE and the actual start of the purchases by the ECB.

Sign in to keep reading

4 more chapters are free with a Lably account.

More in Economics