Between January and December 1991, while the U.S. economy...

Between January and December 1991, while the U.S. economy was falling deeper into its recession, the interest rate on Treasury bills fell from 6.3 percent to 4.1 percent. Use the $I S-L M$ model to explain this pattern of declining output and interest rates. Which curve must have shifted? Can you think of a reason - historically valid or simply imagined - that this shift might have occurred?

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Key Concepts

Shift in the IS Curve

A leftward shift in the IS curve indicates a decline in aggregate demand—due, for example, to lower consumer confidence, reduced investment, or fiscal contraction. In the context of the model, this shift means that for any given interest rate, output is now lower. With the money supply remaining constant, this reduction in output decreases money demand, leading to lower equilibrium interest rates.

Money Demand and Interest Rate Dynamics

In the LM part of the model, the demand for money is closely linked to the level of income or output. When the economy experiences a recession and output falls, the demand for money also decreases. With a fixed money supply, this drop in money demand causes the equilibrium interest rate to decrease. Thus, even without a change in monetary policy, a recession can lead to lower interest rates.

IS-LM Model

The IS-LM model is a fundamental framework in macroeconomics that represents the equilibrium in both the goods market (the IS curve) and the money market (the LM curve). It explains how output and interest rates are determined by the interaction between aggregate demand and the demand for money. This model helps us understand how shifts in either market influence overall economic activity.

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