Macroeconomics Final Exam Master Study Guide

Core Big Ideas in Macroeconomics

Real vs Nominal GDP

Understanding the difference between real and nominal GDP is essential for measuring economic growth accurately.

• Nominal GDP: The value of all final goods and services produced within a country in a given period, measured using current prices.

• Real GDP: The value of all final goods and services produced, measured using base year prices to remove the effects of inflation.

• Importance: Real GDP shows true economic growth by adjusting for price changes, while nominal GDP can be misleading if prices have changed significantly.

• Formula: $\text{Real GDP} = \frac{\text{Nominal GDP}}{\text{GDP Deflator}} \times 100$

• Example: If nominal GDP increases but real GDP does not, the increase is due to higher prices, not more output.

The Circular Flow of Income

The circular flow model illustrates how money moves through the economy between households, firms, government, and the foreign sector.

• Injections: Additions to the economy's income (Investment (I), Government spending (G), Exports (X)).

• Withdrawals (Leakages): Removals from the income flow (Saving (S), Taxes (T), Imports (M)).

• Growth Condition: The economy grows when injections exceed withdrawals: Injections > Withdrawals.

Investment (Macro Definition)

In macroeconomics, investment refers to spending on capital goods such as machinery and buildings, not financial assets like stocks or bonds.

• Example: A factory purchasing new equipment is investment; buying shares is not.

Equilibrium & The Multiplier

Equilibrium Income

Equilibrium occurs when planned aggregate expenditure equals national income.

• Condition: $Y = AE$

• Example: If $Y = 1300 + 0.43Y$, solve for $Y$ to find equilibrium income: $Y = 2281$.

The Multiplier Effect

The multiplier measures how a change in autonomous spending leads to a larger change in equilibrium income.

• Formula: $\text{Multiplier} = \frac{1}{1 - z}$

• Where $z = MPC(1 - t) - m$ (MPC = marginal propensity to consume, t = tax rate, m = marginal propensity to import).

• Change in Income: $\Delta Y = \frac{\Delta G}{1 - z}$

• Closing an Output Gap: $\Delta G = \Delta Y (1 - z)$

• Example: If the output gap is 90 and $z = 0.45$, then $G = 49.5$.

Aggregate Demand & Supply

Aggregate Demand (AD)

AD represents the total demand for goods and services in the economy at different price levels.

• Shifters of AD: Consumption (C), Investment (I), Government spending (G), Net exports (NX).

• Example: Increased business confidence raises investment, shifting AD right.

• Movement vs Shift: Movement along AD is due to price changes; shifts are due to changes in C, I, G, or NX.

Aggregate Supply (AS)

AS shows the total output firms are willing to produce at different price levels.

• Shifters of AS: Wages, input prices, technology, weather.

Output Gaps & Adjustment

Types of Output Gaps

• Inflationary Gap: $Y > Y^*$ (actual output exceeds potential); wages rise, AS shifts left, prices increase.

• Recessionary Gap: $Y < Y^*$ (actual output below potential); wages fall slowly, AS shifts right.

• Adjustment Mechanism: Labour market adjusts wages, shifting AS to restore equilibrium.

The Business Cycle

The business cycle describes fluctuations in economic activity over time.

• Expansion: GDP rises, unemployment falls, prices rise.

• Recession: GDP falls, unemployment rises, prices fall or rise slowly.

• Stagflation: High inflation and high unemployment occur together.

Unemployment

Types of Unemployment

• Frictional: Short-term, normal job search.

• Structural: Mismatch between skills and jobs.

• Cyclical: Due to downturns in the business cycle.

• NAIRU: Non-Accelerating Inflation Rate of Unemployment; the "normal" rate where inflation is stable.

Government, Deficits, and National Saving

National Saving

• Formula: $NS = Y - C - G$

Budget Balance

• Surplus: $T > G$

• Deficit: $G > T$

• Effects of Deficit: Higher interest rates, currency appreciation, lower investment.

• Long Run: Lower deficits promote investment and growth.

Loanable Funds Market

The loanable funds market determines the equilibrium interest rate through the supply and demand for funds.

• Supply: Household saving.

• Demand: Investment by firms.

• Shifters of Supply: Tax incentives to save.

• Shifters of Demand: Business incentives to invest.

Money & Banking

Functions of Money

• Medium of exchange

• Unit of account

• Store of value

• Standard of deferred payment

Money Supply

• Includes: Cash, chequable deposits

• Excludes: Credit cards

Money Creation by Banks

• Banks operate a fractional reserve system, creating money by making loans that become new deposits.

The Bank of Canada

Goals and Policy Tools

• Goals: Price stability, high employment, financial stability, economic growth.

• Main Policy Tool: The overnight rate (target for short-term interest rates).

Monetary Policy

• Expansionary: Lower interest rates to increase spending, GDP, and reduce unemployment.

• Contractionary: Raise interest rates to reduce spending and inflation.

Monetary Transmission Mechanism

1. Money supply increases

2. Interest rates decrease

3. Investment and consumption increase

4. AD shifts right

5. GDP increases

Inflation

Causes of Inflation

• Demand-pull: AD shifts right

• Cost-push: AS shifts left

• Key Idea: Sustained inflation is a monetary phenomenon (linked to money supply growth).

• Output Gap Connection: $Y > Y^*$ leads to wage and price increases; $Y < Y^*$ leads to wage decreases.

• Target: Bank of Canada aims for ~2% inflation.

Economic Growth

Economic growth is measured by increases in real GDP per capita.

• Four Drivers:

  1. Labour

  2. Human capital

  3. Physical capital

  4. Technology

• Key Insight: Productivity growth is the main driver of higher living standards.

Exam Preparation: Key Formulas and Concepts

Concept	Formula
Equilibrium Income	$Y = AE$
Multiplier	$\text{Multiplier} = \frac{1}{1 - z}$
Change in Income	$\Delta Y = \frac{\Delta G}{1 - z}$
National Saving	$NS = Y - C - G$
Inflation	AD ↑ or AS ↓
Bank of Canada Policy	Controls interest rates → AD
Wage Adjustment	Wages adjust → AS shifts
Long Run Output	$Y = Y^*$

Exam Tips

• Practice calculation problems: Real vs Nominal GDP, multiplier, equilibrium income, government spending to close gaps.

• Be able to explain and interpret AD/AS graphs, output gap adjustments, and monetary policy effects.

• Review short answer topics: types of unemployment, Bank of Canada goals, money creation, loanable funds.

• Prepare for long answer questions: explaining shocks and adjustment processes, monetary policy using AD/AS framework.

Additional info: This guide synthesizes core macroeconomic concepts and formulas, providing a comprehensive review for final exam preparation. Students should supplement with practice problems and graph analysis for mastery.