Quantitative Easing

Central bank purchases of long-dated assets to inject liquidity and lower yields.

Quantitative easing (QE) is a monetary policy tool used by central banks to stimulate an economy when standard monetary policy has become ineffective. It involves the central bank purchasing large quantities of government bonds or other financial assets from the market. This massive influx of buying increases the money supply, injects liquidity directly into the financial system, and bids up the price of those assets, which conversely lowers their yields. Central banks typically turn to QE when their benchmark interest rates are already at or near zero, leaving them with no room to cut rates further to spur borrowing. By purchasing longer-term securities, the central bank aims to lower longer-term interest rates across the broader economy. This makes it cheaper for businesses and consumers to borrow money for mortgages, car loans, and business expansion, thereby encouraging spending and investment. For retail investors, QE is highly significant because it generally supports asset prices. Lower yields on safe government bonds push investors into riskier assets like stocks and corporate bonds in search of higher returns. However, a common pitfall of prolonged QE is that it can lead to asset price bubbles, currency depreciation, and high inflation if too much money chases too few goods and services. Investors must also watch for the eventual reversal of this policy, known as quantitative tightening.

Suppose a central bank wants to lower borrowing costs during a recession. It creates new electronic money and purchases $100 billion of 10-year government bonds from commercial banks. This increases the cash reserves of those banks by $100 billion. With excess cash that earns little interest, the banks lower their lending rates to 3% (down from 5%) to attract corporate borrowers, stimulating new business investments.