The Liquidity Trap

Why cutting interest rates may stop working when rates are near zero, and how Japan and other economies struggled with this problem.

Central banks usually fight recessions by cutting interest rates. But what happens when rates are already near zero? Economists call this situation a liquidity trap.

The zero lower bound

Interest rates cannot easily fall far below zero, because people can hold cash, which pays zero interest, instead of depositing money at negative rates. This limit is called the zero lower bound. Some central banks set slightly negative rates, but only so far.

Why the trap matters

In a liquidity trap:

Cutting rates further is impossible or has little effect.
People and businesses may hoard cash rather than spend or invest, especially if they expect prices to fall.
Deflation, falling prices, can make things worse, raising the real value of debts and encouraging people to delay purchases.

Keynes discussed this possibility in the 1930s, when monetary policy seemed to lose its power during the Great Depression.

Real-world examples

Japan: after its asset bubble burst around 1990, Japan cut rates to near zero by the late 1990s and struggled with low growth and mild deflation for years.
After 2008: the United States, Europe and the United Kingdom cut rates close to zero and kept them there for years.

Ways out

When interest rates cannot fall further, policymakers have used:

Quantitative easing: buying bonds to lower long-term rates.
Forward guidance: promising to keep rates low.
Fiscal policy: government spending, which economists such as Paul Krugman argued is especially powerful in a liquidity trap, since it does not push up interest rates that are stuck at zero.
Raising inflation expectations, making real interest rates negative.

Waiting for prices to fall

A family plans to buy a new car. If they expect car prices to fall next year, they wait. Many households waiting reduces sales, factories cut production and prices fall further, confirming expectations. In a liquidity trap with deflation, this cycle can be hard to break with interest rate cuts alone.

Thinking central banks can always stimulate the economy by cutting rates

Once rates are near zero, conventional cuts are limited. Central banks and governments then need other tools, such as quantitative easing and fiscal policy.

Key takeaways

A liquidity trap occurs when interest rates near zero stop stimulating the economy.
Rates cannot fall far below zero because people can hold cash.
Japan from the 1990s and many economies after 2008 faced this problem.
Quantitative easing, forward guidance and fiscal policy are tools to escape.