The IS-LM Model: Short-Run Macroeconomic Analysis and Policy Effects

What does the IS-LM model explain?

How the economy works over a short time horizon, such as 1-2 years.

What economic changes can shift the IS curve?

Government tax cuts or spending changes.

What economic changes can shift the LM curve?

Interest rate changes.

What does the IS curve indicate about interest rates and demand for goods?

As interest rates decrease, the demand for goods (Z) increases.

What is the equation representing the demand for goods in the IS curve?

Z = C + I(↓i) + G + NX.

What does I(↓i) signify in the IS curve?

Investment is a negative function of the interest rate.

How does GDP affect investment according to the IS curve?

Investment also depends on GDP, I = I(Y,i).

What does the LM curve represent?

All (Y,i) combinations that cause a financial market equilibrium.

What is the formula for money demand (Md) in the LM curve?

Md = $Y * L(i), where L(i) is a decreasing function of the interest rate.

What happens to real money demand when real GDP increases?

Real money demand increases, leading to higher interest rates.

What is the relationship between price level and real money demand?

When the price level goes up, nominal money holdings must increase to keep real money constant.

What does the modern LM curve with interest-rate targeting imply?

When GDP increases, the Fed increases the money supply to keep the interest rate at its target value.

What is the goods market equilibrium condition in the IS-LM model?

Y = C + I + G + NX.

What is the significance of the 45-degree line in the IS-LM model?

It represents all combinations of output (Y) and interest rates (i) that lead to goods market equilibrium.

What happens to the IS curve when the interest rate decreases?

Investment increases, causing Z and Y to increase.

What is the effect of an increase in government spending (G) on the LM curve?

It increases real GDP, which in turn increases money demand and interest rates.

What is the formula for real money demand in terms of price level and GDP?

Md/P = Y * (0.20 - i).

What is the impact of a decrease in government spending on GDP?

It can lead to a decrease in GDP, which may prompt the Fed to reduce interest rates to maintain GDP.

What does the IS-LM model illustrate about the relationship between fiscal and monetary policy?

It shows how changes in government spending and interest rates affect overall economic equilibrium.

What does the term 'financial market equilibrium' refer to in the LM curve?

It refers to the condition where money supply equals money demand.

What is the role of the Federal Reserve in the IS-LM model?

To adjust the money supply to achieve target interest rates.

How does the IS-LM model help in understanding economic policy effects?

It provides a framework to analyze the short-run impacts of fiscal and monetary policies.

What is the goods market equilibrium equation?

Y = Z

What does Y represent in the equation Y = C + I + G + NX?

Y represents the total output or income in the economy.

What is the formula for Y derived from the goods market?

Y = 2.5 * (10 - 100i)

What does the IS curve equation Y = 25 - 250i represent?

It shows the relationship between income (Y) and interest rates (i) in the goods market.

If the interest rate i = 0.02, what is the value of Y?

Y = 20

What are the values of consumption (C) and investment (I) when Y = 20?

C = 14, I = 2

How can the Fed implement their target interest rate of i = 0.02?

By ensuring real money supply equals real money demand.

What is the equation for real money demand when i = 0.02?

M = 4

What happens to the economy if the Fed cuts the interest rate to i' = 0.01?

The economy moves down along the IS curve, resulting in Y' = 22.50.

What is the new money supply (M') when Y' = 22.50 and i' = 0.01?

M' = 5.125

What is the effect of an increase in government spending (G') on the IS curve?

The IS curve shifts outwards.

What is the new IS curve equation when G increases to G' = 5?

Y = 27.50 - 250i

What is the new money supply (M') required when G' = 5?

M' = 4.625

What happens to the economy if government spending decreases to G' = 3?

The IS curve shifts inwards.

What is the new IS curve equation when G decreases to G' = 3?

Y = 22.50 - 250i

What should the new money supply (M') be when Y' = 17.50 and i = 0.02?

M' = 3.375

Why might the government decrease spending?

To reduce future tax payments and public debt, allowing more private savings.

Why might the Fed cut interest rates?

To stimulate the economy when output is below potential.

What is the policy mix used by the government and Fed?

Cut government spending to reduce the deficit and lower interest rates to maintain output.

What is the relationship between potential output and inflation?

Going slightly above potential output can increase inflation.

What does the slope of the Z equation represent in the goods market?

The slope represents the marginal propensity to consume (0.6).

What is the significance of the IS-LM diagram?

It illustrates the interaction between the goods market (IS curve) and the money market (LM curve).

What does the term 'crowding out' refer to?

It refers to the reduction in private investment due to increased public spending.

What is the equation for money demand when Y = 20?

M/P = 0.25(20) - 50(0.02)

What is the effect of an increase in Y on money demand?

An increase in Y shifts the money demand curve up.