LM Curve and Money Market Equilibrium Quiz: Interest Rate

The LM curve represents all combinations of national income and the interest rate at which the supply of money equals the demand for money, putting the money market in equilibrium. As income rises, the demand for money for transactions increases. To maintain equilibrium with an unchanged money supply, the interest rate must rise to reduce the speculative demand for money. This positive relationship between income and the interest rate gives the LM curve its upward slope.

The answer is True. As national income rises, households and businesses need more money to carry out a greater volume of transactions. If the money supply is fixed, this additional demand for money must be offset by a higher interest rate, which reduces the amount of money people want to hold for speculative or wealth purposes. The result is that higher income levels are associated with higher interest rates along the LM curve, giving it a positive slope.

The LM curve shifts rightward when the central bank increases the money supply. With more money available, the money market can be in equilibrium at a lower interest rate for every level of income, or at the same interest rate with a higher level of income. This expansion in the money supply means that economic activity can be supported at a lower cost of borrowing, shifting the entire LM curve to the right and reflecting easier monetary conditions across the economy.

When the central bank reduces the money supply, there is less money available to satisfy the transactions and speculative demands at any given income level. To restore equilibrium in the money market, the interest rate must rise at every income level, making borrowing more expensive across the economy. This upward shift in the interest rate for each income level causes the LM curve to shift leftward, reflecting tighter monetary conditions and a higher cost of credit throughout the economy.

The LM curve shifts when either the money supply or the money demand schedule changes. An increase in the money supply shifts it rightward, a decrease shifts it leftward, and a fall in money demand at every income level also shifts it rightward. An increase in government spending affects the goods market and shifts the IS curve rather than the LM curve. The LM curve is determined purely by money market conditions, not by fiscal policy decisions.

The answer is False. The LM curve is affected by changes in the price level. A rise in the price level reduces the real value of the money supply, which is the purchasing power of the existing nominal money stock. With a lower real money supply, the money market requires a higher interest rate to clear at any given income level, effectively shifting the LM curve leftward. This is why the LM curve is properly understood in real terms, not simply nominal ones.

In the IS LM BP framework, money demand has two main components. Transactions demand arises because households and firms need money to facilitate everyday purchases, and it rises with income. Speculative or asset demand arises because holding money is one option for storing wealth, and it falls when interest rates rise because higher rates make interest-bearing assets more attractive. Together these two components explain why money demand increases with income and decreases with the interest rate.

A steeper LM curve reflects a situation where money demand is more sensitive to income than to interest rates. When income rises, money demand increases substantially, but since the interest rate is not very effective at reducing money demand, the interest rate must rise sharply to restore equilibrium. Conversely, a flatter LM curve reflects high interest sensitivity of money demand, where small interest rate changes are enough to clear the money market after an income change.

The answer is True. The LM curve represents money market equilibrium, and the central bank directly controls the money supply. By conducting open market operations, buying or selling government securities, the central bank expands or contracts the money supply, shifting the LM curve. While fiscal policy shifts the IS curve and exchange rate or trade changes shift both the IS and BP curves, the LM curve is the one curve that monetary policy directly controls in the standard IS LM BP model.

The LM curve slopes upward because higher income raises transactions demand for money, requiring a higher interest rate to maintain equilibrium with a fixed supply. It shifts rightward when the money supply increases and leftward when it decreases. It represents money market equilibrium. The claim that it shifts leftward when income falls is incorrect; a fall in income would cause a movement along the LM curve to a lower interest rate, not a shift of the entire curve.

The liquidity trap describes a situation at very low interest rates, typically near zero, where people expect rates to rise in the future and therefore prefer holding money rather than interest-bearing assets. At this point, any additional money injected by the central bank is simply absorbed into idle money holdings rather than stimulating spending or lowering interest rates further. The LM curve becomes nearly horizontal in this range, making monetary policy largely ineffective at raising output.

The answer is True. The LM curve is drawn for a given real money supply. When the price level rises, the nominal money stock buys fewer goods and services, reducing the real money supply. With less real money available, the money market can only clear at a higher interest rate for any given level of real income. This is equivalent to a leftward shift of the LM curve, since higher interest rates are now needed at every income level to maintain money market equilibrium.

A rightward LM shift means the money market is in equilibrium at a lower interest rate for every level of income. When this occurs with an unchanged IS curve, the new intersection of IS and LM occurs at lower interest rates and higher output. Lower rates stimulate investment and other interest-sensitive spending, pushing output upward. This is precisely how expansionary monetary policy operates in the IS LM BP model, working through interest rate reductions to boost demand.

The LM curve is determined by money supply and demand conditions in the money market. The central bank can shift it by changing the money supply through open market operations. The interest rate adjusts along the LM curve to clear the money market at every income level. The claim that the LM curve slopes downward is incorrect; it slopes upward because higher income raises money demand, requiring a higher interest rate to restore equilibrium with a fixed money supply.

When income rises, households and businesses need more money for transactions, increasing the demand for money. With the money supply fixed, this excess demand must be cleared by a higher interest rate, which reduces speculative money holdings enough to restore equilibrium. This is not a shift of the LM curve but a movement up along it, reflecting the positive relationship between income and the interest rate that defines the slope of the LM schedule throughout the model.