Questions: Liquidity Preference Theory and Interest Rate Determination

Question 1

The central bank increases the money supply. According to liquidity preference theory, what is the direct chain of events that lowers interest rates?

• A. The government announces lower rates, and expectations adjust immediately
• B. People find themselves holding more cash than they want at the existing rate, so they buy bonds; higher bond demand raises bond prices, which lowers bond yields (the interest rate)
• C. Higher money supply raises inflation, which automatically lowers real interest rates
• D. Banks are required to lend more when reserves increase, which forces competitive rate cuts

Answer: (B)

The transmission mechanism in liquidity preference theory runs through the bond market. When the money supply exceeds desired money holdings, people are 'overloaded' with liquidity — they try to exchange excess cash for bonds. This demand pushes bond prices up, and since bond yields move inversely to prices, interest rates fall. This continues until the new equilibrium is reached where desired money holdings equal the new, larger money supply.

Question 2

Keynes argued that monetary policy loses effectiveness in a 'liquidity trap.' Which description is correct?

• A. Banks hold too much liquidity in reserve and refuse to lend to businesses
• B. A legal cap on money supply prevents the central bank from expanding further
• C. At very low interest rates, money demand becomes nearly unlimited — additional money injected by the central bank is absorbed as idle cash rather than pushing rates down further
• D. Consumers spend money so quickly that any monetary injection circulates out of the banking system

Answer: (C)

In the liquidity trap, people widely expect interest rates to rise (bond prices to fall), so they prefer holding cash over bonds. The speculative demand for money becomes nearly infinitely elastic near zero rates — any new money is willingly absorbed without driving rates lower. This is why Keynes argued that in a depression, fiscal policy (government spending) rather than monetary policy was the appropriate tool.

Question 3

In Keynes's liquidity preference framework, the interest rate is essentially the price of borrowing money from savers who want a return on their savings.

• T. True
• F. False

Answer: False

This is the classical loanable-funds view, which Keynes explicitly replaced. In Keynes's framework, the interest rate is the price of liquidity — the return required to persuade people to give up cash and hold less-liquid assets like bonds. The key motivation is speculative: people hold money when they expect bond prices to fall (interest rates to rise), not simply to earn a return on past saving.

Question 4

In a liquidity trap, fiscal policy may be more effective than monetary policy at stimulating aggregate demand.

• T. True
• F. False

Answer: True

When interest rates are at (or near) zero, the standard monetary transmission mechanism breaks down — new money is absorbed as idle cash without reducing rates further. Investment and spending cannot be stimulated by lower borrowing costs because rates cannot go lower. Fiscal policy (government spending or tax cuts) injects demand directly without relying on the interest rate channel, which is why Keynes advocated it for the Great Depression and why it re-emerged as a live debate after 2008.

Question 5

Explain the mechanism by which an increase in the money supply lowers interest rates in the liquidity preference framework.

Model answer: An increase in the money supply creates an excess supply of money at the existing interest rate — people hold more cash than they wish to. To reduce their cash holdings, they buy bonds. This increased demand drives bond prices up. Since bond yields (interest rates) move inversely to bond prices, rates fall. This process continues until desired money holdings again equal the (larger) money supply, establishing a new, lower equilibrium interest rate.

The key is that equilibrium is restored through the bond market, not through direct announcement. The central bank never sets rates by fiat in this model — it adjusts the money supply, and market participants respond by buying or selling bonds until desired money holdings match actual money supply. This indirect channel is also why the liquidity trap is so problematic: if bond prices are already high and everyone expects them to fall, the extra money simply sits as cash instead of flowing into bonds.