Macroeconomics Study Notes: Economic Growth, Financial System, Money, Monetary Policy, and Open Economy

Chapter 10: Economic Growth, Financial System, and Business Cycles

Business Cycles vs. Long-Run Economic Growth

• Business Cycles refer to short-term fluctuations in economic activity, typically caused by specific shocks (e.g., oil price changes, financial crises).

• Long-Run Economic Growth involves sustained increases in productivity and output over several years, leading to higher living standards.

• Key Difference: Business cycles are temporary and often reversible, while long-run growth reflects permanent improvements in the economy's productive capacity.

Growth Rate Calculations

• Growth Rate of Real GDP: Measures the percentage change in real GDP from one year to the next.

• Formula: $\text{Growth Rate} = \frac{\text{Real GDP}_{t} - \text{Real GDP}_{t-1}}{\text{Real GDP}_{t-1}} \times 100$

Rule of 70

• Used to estimate the number of years required for a variable (such as real GDP per capita) to double, given a constant growth rate.

• Formula: $\text{Number of years to double} = \frac{70}{\text{Growth Rate (\%)}}$

• Example: If the growth rate is 2%, it will take approximately 35 years for GDP to double.

Productivity

• Definition: The quantity of goods and services produced by one worker or one hour of work.

• Importance: Productivity is the key driver of economic growth.

• Determinants of Productivity:

  • Human Capital: Knowledge and skills acquired by workers.

  • Physical Capital: Machinery, tools, and infrastructure.

  • Natural Resources: Inputs provided by nature (e.g., land, minerals).

  • Technology: Processes and innovations that improve the efficiency of production.

• Difference between Human Capital and Technology: Human capital refers to the skills and education of workers, while technology refers to the methods and processes used to produce goods and services.

Productivity and National Income

• Higher productivity leads to increased economic output and higher national income.

Actual vs. Potential GDP

• Actual GDP: The real output currently produced by the economy.

• Potential GDP: The level of real GDP the economy can produce when operating at full employment.

Savings and Investment

• Private Savings: Savings by households from their disposable income. $\text{Private Savings} = Y - T - C$

• Public Savings: Savings by the government. $\text{Public Savings} = T - G$

• National Savings: Total savings in the economy. $\text{National Savings} = (Y - T - C) + (T - G)$

• Budget Deficit: When government spending exceeds tax revenue ($G > T$).

• Budget Surplus: When tax revenue exceeds government spending ($T > G$).

• Savings-Investment Identity (Closed Economy): $S = I$ (Savings equals Investment).

Loanable Funds Model

• Explains how the market interest rate is determined by the supply and demand for loanable funds.

• Supply of Loanable Funds (SLF): Comes from savings.

• Demand for Loanable Funds (DLF): Comes from investment.

• Public Policies and Loanable Funds:

  • Saving Incentives: (e.g., lower taxes on interest income) increase SLF, lower interest rates, and raise investment.

  • Investment Incentives: (e.g., tax credits for investment) increase DLF, raise interest rates, and increase investment.

  • Budget Deficit: Reduces SLF, raises interest rates, and crowds out investment.

  • Budget Surplus: Increases SLF, lowers interest rates, and boosts investment.

Chapter 11: Long-Run Economic Growth: Sources and Policies

Public Policies and Economic Growth

• Governments can influence economic growth through policies affecting investment, taxation, human capital, public goods, infrastructure, and regulation.

Economic Growth and Living Standards

• Economic growth increases income, employment, and access to goods and services.

• The benefits of growth depend on distribution and public policy.

Productivity and Economic Growth

• Long-run economic growth is driven by productivity growth, which raises living standards, output, and income.

Diminishing Returns to Capital

• As capital per worker increases, output rises but at a decreasing rate (diminishing returns).

• Solow Growth Model: Emphasizes the roles of capital accumulation and technological change in long-run growth.

Technology and Productivity Growth

• Technological progress is essential for sustained productivity and GDP growth.

• It transforms industries, improves efficiency, creates new markets, and is a focus for policymakers.

New Growth Model (Paul Romer)

• Emphasizes that technological change results from economic incentives and the market system.

Catch-Up Effect

• Poor countries tend to grow faster than rich countries because they have less capital per worker and can adopt existing technologies.

Public Policies and Loanable Funds Model

• Similar to Chapter 10, public policies can shift the supply and demand for loanable funds, affecting interest rates and investment.

Chapter 14: Banks, Money, and the Federal Reserve System

Definition and Functions of Money

• Money: Assets generally accepted in exchange for goods and services or for payment of debts.

• Functions of Money:

  1. Medium of Exchange

  2. Unit of Account

  3. Store of Value

  4. Standard of Deferred Payment

Types of Money

• Commodity Money: Has intrinsic value (e.g., gold, silver).

• Fiat Money: Has value by government decree (e.g., paper currency).

Money Supply: M1 and M2

• M1: Currency in circulation, checking account deposits, and savings account deposits.

• M2: M1 plus small-denomination time deposits and non-institutional money market fund shares.

Financial System: Commercial and Central Banks

• Commercial Banks: Accept deposits and make loans.

• Central Banks: Manage monetary policy, ensure financial stability, and promote economic growth (e.g., Federal Reserve in the US).

Fractional Reserve Banking System

• Banks keep only a fraction of deposits as reserves; the rest is loaned out.

• Required Reserves: Minimum reserves banks must hold by law.

• Excess Reserves: Reserves above the required minimum.

Money Creation, Money Multiplier, Reserve Ratio

• Money Multiplier: The amount of money the banking system generates with each dollar of reserves.

• Formula: $\text{Money Multiplier} = \frac{1}{\text{Reserve Ratio}}$

• Inverse relationship: As the reserve ratio increases, the money multiplier decreases.

Bank Balance Sheet

• Shows assets (loans, reserves) and liabilities (deposits, borrowings) of a bank.

Role of Central Bank (Federal Reserve)

• Implements monetary policy, acts as lender of last resort, and regulates the banking system.

Monetary Policy Tools and Federal Funds Rate

• Tools include open market operations, discount rate, and reserve requirements.

• Federal Funds Rate: The interest rate at which banks lend reserves to each other overnight.

Money Growth and Inflation

• In the long run, growth in the money supply leads to inflation.

Quantity Theory of Money

• Links money supply growth to inflation.

• Equation: $M \times V = P \times Y$ Where $M$ = money supply, $V$ = velocity of money, $P$ = price level, $Y$ = real output.

Monetary Neutrality and Classical Dichotomy

• Monetary Neutrality: Changes in the money supply affect only nominal variables, not real variables, in the long run.

• Classical Dichotomy: Real variables (output, employment) are independent of nominal variables (money supply, prices).

Real vs. Nominal Variables

• Real Variables: Adjusted for inflation (e.g., real GDP, real interest rates).

• Nominal Variables: Measured in current prices (e.g., nominal GDP, nominal interest rates).

Cost of Inflation and Hyperinflation

• Cost of Inflation: Includes menu costs, shoe-leather costs, and redistribution of wealth.

• Hyperinflation: Extremely high and accelerating inflation, often leading to economic collapse.

Chapter 15: Monetary Policy

Monetary Policy and Federal Reserve Goals

• Monetary Policy: Actions by the central bank to manage the money supply and interest rates to achieve macroeconomic goals.

• Goals:

  1. Price Stability (control inflation)

  2. High Employment (low unemployment)

  3. Stability of Financial Markets and Institutions

  4. Economic Growth

Monetary Expansion and Contraction

• Monetary Expansion: Central bank increases the money supply, typically lowering interest rates and stimulating investment and consumption.

• Monetary Contraction: Central bank decreases the money supply, raising interest rates to control inflation.

• Lender of Last Resort: The Fed provides liquidity to banks to prevent collapse during crises.

Monetary Policy and Aggregate Demand/Supply

• Interest rates affect aggregate demand by influencing consumption, investment, and net exports.

• Changes in price levels move the economy along the aggregate demand curve.

Chapter 17: Inflation, Unemployment, and Federal Reserve Policy

Short-Run Trade-off: Unemployment and Inflation (Phillips Curve)

• Short-Run Phillips Curve: Shows an inverse relationship between inflation and unemployment.

• Higher inflation is associated with lower unemployment, and vice versa.

• Disinflation: A significant reduction in the inflation rate.

Short-Run vs. Long-Run Phillips Curves

• Short-Run: The curve can shift due to changes in aggregate demand.

• Long-Run: The Phillips curve is vertical; there is no trade-off between inflation and unemployment in the long run.

AD-AS Model and the Phillips Curve

• Aggregate Demand (AD) and Aggregate Supply (AS) curves help explain movements along and shifts of the Phillips curve.

Monetary Policy and Inflation Expectations

• Expectations of inflation influence wage-setting and price-setting behavior.

• Rational Expectations: Economic agents use all available information to form expectations about future inflation.

Federal Reserve Policy Since the 1970s

• Oil price shocks (e.g., 1974) shifted the short-run AS curve left, increasing inflation and unemployment (stagflation).

• The Fed sometimes prioritized reducing unemployment over controlling inflation, which could worsen inflation.

Chapter 18: Open Economy Macroeconomics

Closed vs. Open Economy

• Open Economy: Engages in international trade and financial transactions.

• Closed Economy: No international trade or financial flows.

Components of an Open Economy

• Output Markets: Trade of goods and services between countries.

• Financial Markets: Cross-border movement of capital and investments.

• Labor Markets: International mobility of workers.

Net Exports

• Definition: Value of exports minus value of imports.

• Implications: Positive net exports contribute to economic growth.

• Determinants: Exchange rates, trade policies, and global economic conditions.

Net Capital Outflows

• Definition: Net flow of funds invested abroad by a country.

• Implications: Positive net capital outflow indicates more investment abroad than received from foreigners.

• Impacts currency value and interest rates.

Savings-Investment Identity (Open Economy)

• In an open economy, savings can be used for domestic investment or to purchase foreign assets.

• Formula: $S = I + NCO$ Where $NCO$ is net capital outflow.

Exchange Rates

• Nominal Exchange Rate: Value of one currency in terms of another.

• Real Exchange Rate: Price of domestic goods in terms of foreign goods.

• Formula: $\text{Real Exchange Rate} = \text{Nominal Exchange Rate} \times \frac{\text{Domestic Price Level}}{\text{Foreign Price Level}}$

• Exchange rates affect trade balance, capital flows, and economic growth.

Appreciation and Depreciation

• Appreciation: Increase in the value of a currency relative to others; makes exports more expensive and imports cheaper.

• Depreciation: Decrease in the value of a currency; makes exports cheaper and imports more expensive, potentially increasing inflation.