Chapter 18: Linking Interest Rates and Output Using IS-MP Analysis

Vocabulary practice flashcards covering aggregate expenditure, the IS curve, the MP curve, macroeconomic equilibrium, and shocks within the IS-MP framework.

Aggregate expenditure ($AE$)

The total amount of goods and services that people want to buy across the entire economy, calculated as the sum of consumption ($C$), planned investment ($I$), government purchases ($G$), and net exports ($NX$): $AE = C + I + G + NX$.

Macroeconomic equilibrium

The state where the total production of output ($Y$) equals aggregate expenditure ($AE$), meaning the quantity of output suppliers produce matches what buyers collectively want to purchase.

Equilibrium output

The level of output at the point of macroeconomic equilibrium, which describes the economy's resting point in the short run.

Potential output

The economy's highest sustainable level of production, achieved when all resources (labor, human capital, physical capital, and technology) are fully employed.

Output gap

The difference between actual output and potential output, expressed as a percentage of potential output: $\text{Output gap} = \frac{\text{Actual output} - \text{Potential output}}{\text{Potential output}} \times 100$.

Real interest rate ($r$)

The nominal interest rate adjusted for inflation, representing the opportunity cost of spending money in the current year rather than saving it.

IS curve

A downward-sloping curve illustrating how lower real interest rates stimulate aggregate expenditure and raise output, leading to a higher and more positive output gap.

Monetary policy

The process of setting interest rates by a central bank (such as the Federal Reserve) in an effort to influence broader macroeconomic conditions.

Federal funds rate

The interest rate on overnight loans between banks that are virtually certain to be repaid the next day, which serves as the Federal Reserve's primary policy tool.

Risk-free interest rate

The interest rate on a loan that involves no risk of default, effectively set and managed by the Federal Reserve.

Risk premium

The extra interest that lenders charge borrowers to compensate for the risk involved in loaning money, determined in financial markets.

MP curve

A horizontal curve illustrating the current real interest rate, which equals the risk-free rate set by monetary policy plus the risk premium determined by financial markets ($\text{Real interest rate} = \text{Risk-free real interest rate} + \text{Risk premium}$).

IS-MP framework

A macroeconomic model that determines the equilibrium output gap and real interest rate at the intersection of the downward-sloping IS curve and the horizontal MP curve.

Fiscal policy

The government's use of spending and taxation policies to influence economic outcomes, which directly changes aggregate expenditure and shifts the IS curve.

Multiplier

A measure of how much GDP changes as a result of both the direct and indirect ripple effects flowing from each extra dollar of spending ($\Delta\text{GDP} = \Delta\text{Spending} \times \text{Multiplier}$).

Spending shock

Any shift in consumption, planned investment, government purchases, or net exports at a given real interest rate that causes the IS curve to shift horizontally by $\Delta\text{Spending} \times \text{Multiplier}$.

Financial shock

Any change in borrowing conditions—resulting from changes in the Federal Reserve's risk-free rate or financial market risk premiums—that shifts the MP curve vertically up or down.