Macroeconomics Final Exam Comprehensive Exam Study Notes

Basic Economic Concepts

Rational Self-Interest: Economics assumes that individuals make choices that are logical and aimed at maximizing their own personal satisfaction or well-being.
Purposeful Behavior: Individuals and institutions make decisions based on specific goals, showing that economic actions are intentional rather than random.
Utility and Choosing the Highest Satisfaction: Utility represents the pleasure, happiness, or satisfaction obtained from consuming a good or service. The core of economic decision-making involves comparing the utility of different options and choosing the one that provides the highest level of satisfaction.
Opportunity Cost: This represents the value of the next best alternative that is sacrificed or foregone when a choice is made.
Production Possibilities Curve (PPC):
- Efficient Production: Points located exactly on the curve represent the maximum possible output using all available resources and technology.
- Inefficient Production: Points located inside the curve indicate that resources are being underutilized or used poorly.
- Attainable vs. Unattainable Points: Points on or inside the curve are attainable with current resources; points outside the curve are currently unattainable.
Economic Systems:
- Market Economy: Resources are allocated through the decentralized decisions of many firms and households as they interact in markets for goods and services.
- Command Economy: A central authority (government) makes all significant economic decisions regarding production and distribution.
- Mixed Economy: An economic system that incorporates elements of both market and command systems, with varying degrees of government intervention.
Laissez-faire Capitalism: An economic environment where the government's role is strictly limited to protecting private property and maintaining a legal framework, allowing markets to function with minimal interference.
The Five Fundamental Questions of Economics: These determine how a society manages its resources:
1. What goods and services will be produced?
2. How will the goods and services be produced?
3. Who will get the goods and services?
4. How will the system accommodate change?
5. How will the system promote progress?

Supply and Demand

Distinguishing Between Movements and Shifts:
- Movement along a curve: Occurs only when the price of the specific good changes, resulting in a change in the quantity demanded or quantity supplied.
- Shift in a curve: Occurs when a factor other than price (a determinant) changes, moving the entire curve to the right (increase) or left (decrease).
Classifications of Goods:
- Substitute Goods: Goods used in place of one another; an increase in the price of one leads to an increase in demand for the other.
- Complementary Goods: Goods used together; an increase in the price of one leads to a decrease in demand for the other.
- Normal Goods: Goods for which demand increases as consumer income rises.
- Inferior Goods: Goods for which demand decreases as consumer income rises.
Market Equilibrium: This is the point where the quantity demanded equals the quantity supplied. It can be identified in a supply and demand table where the price allows the two quantities to match.
Market Failure: A situation in which the market on its own fails to allocate resources efficiently, often leading to the need for government intervention.
Consumer Surplus: The difference between the maximum price a consumer is willing to pay for a product and the actual price they do pay.
Producer Surplus: The difference between the actual price a producer receives and the minimum price they would be willing to accept.

Public Goods and Government

Private Goods: Goods that are both excludable (people can be prevented from using them) and rivalrous (one person's use diminishes another person's use).
Public Goods: Goods that are non-excludable and non-rivalrous, such as national defense or street lighting, which often leads to the free-rider problem.
Quasi-public Goods: Goods that have some characteristics of public goods but could be provided through a market system (e.g., education or libraries).
Cost-Benefit Analysis: A systematic approach used to determine the economic feasibility of a project by comparing the total expected costs against the total expected benefits.
Marginal Benefit vs. Marginal Cost: Decision-making involves comparing the additional benefit of one more unit of an activity ( $MB$ ) to the additional cost of that unit ( $MC$ ). Resources are allocated efficiently when $MB = MC$ .

Measuring Economic Performance

Gross Domestic Product (GDP): The total market value of all final goods and services produced within a country's borders in a specific time period.
Nominal GDP: GDP measured in current prices, which does not account for the effects of inflation.
Real GDP: GDP adjusted for inflation, representing the actual volume of production.
Price Index: A measure of the average price level changes for a specific set of goods and services over time.
GDP Deflator: A price index specifically used to convert nominal GDP into real GDP.
Intermediate vs. Final Goods:
- Intermediate Goods: Goods used as inputs in the production of other goods (not counted in GDP to avoid double counting).
- Final Goods: Goods sold to the end user (counted in GDP).
Inventory Changes: Unsold goods are treated as inventory and are included in GDP calculations as part of investment.
Economic Growth: An increase in real GDP or real GDP per capita over a period of time.
Real GDP per Capita: A measure of the average economic output per person.
Calculation Formula: $Real\,GDP = \left( \frac{Nominal\,GDP}{Price\,Index} \right) \times 100$

Unemployment

Labor Force: The total number of people who are either employed or actively seeking work.
Employment: Individuals who currently have jobs.
Unemployment: Individuals who do not have a job but are actively looking for one.
Discouraged Workers: Individuals who have stopped looking for work because they believe no jobs are available; they are not counted in the labor force.
Labor Force Participation: The percentage of the working-age population that is in the labor force.
Types of Unemployment:
- Frictional: Short-term unemployment that occurs when people are between jobs or entering the workforce for the first time.
- Structural: Unemployment resulting from a mismatch between the skills of workers and the requirements of available jobs (often due to technological changes).
- Cyclical: Unemployment caused by a decline in total spending, typically during the recession phase of the business cycle.
Natural Rate of Unemployment: The sum of frictional and structural unemployment; the level of unemployment that exists when the economy is at full employment.
Calculation Formula: $Unemployment\,Rate = \left( \frac{Unemployed}{Labor\,Force} \right) \times 100$

Consumption, Saving, and the Multiplier

Disposable Income: The amount of income remaining after taxes have been paid ( $Income - Taxes$ ).
Consumption: The portion of disposable income spent on goods and services.
Saving: The portion of disposable income not spent on consumption.
Average Propensity to Consume (APC): The fraction of total disposable income that is spent.
Average Propensity to Save (APS): The fraction of total disposable income that is saved.
Marginal Propensity to Consume (MPC): The ratio of the change in consumption to the change in disposable income.
Marginal Propensity to Save (MPS): The ratio of the change in saving to the change in disposable income.
Fundamental Identity: $MPC + MPS = 1$
The Multiplier Formula: $Multiplier = \frac{1}{MPS}$
Economic Determinants: Be able to analyze how changes in taxes, government spending, and net exports influence the overall economic equilibrium via the multiplier.

Aggregate Demand and Aggregate Supply

Aggregate Demand (AD): A schedule or curve showing the total quantity of goods and services demanded at different price levels.
Aggregate Supply (AS): A schedule or curve showing the total quantity of goods and services that firms will produce at different price levels.
Short-run Aggregate Supply (SRAS): The period where wages and resource prices are slow to adjust to changes in the price level.
Long-run Aggregate Supply (LRAS): The period where all prices are flexible; the curve is vertical at the economy's potential output.
Factors Shifting AD and AS:
- Productivity: The measure of real output per unit of input; an increase shifts AS to the right.
- Excess Capacity: The amount by which the actual output of an industry is less than the maximum possible output; high excess capacity can decrease investment spend.
- Business Expectations: Optimism or pessimism about future sales and profits can shift AD through investment spending.
Output Gaps:
- Inflationary Gap: When equilibrium real GDP is above potential GDP.
- Recessionary Gap: When equilibrium real GDP is below potential GDP.

Fiscal Policy

Fiscal Policy: The use of government spending and taxation to influence the economy.
Expansionary Fiscal Policy: Increases in government spending or decreases in taxes designed to increase AD and close a recessionary gap.
Contractionary Fiscal Policy: Decreases in government spending or increases in taxes designed to decrease AD and control inflation.
Budget Deficit: Occurs when government spending exceeds tax revenue in a single year.
Budget Surplus: Occurs when tax revenue exceeds government spending in a single year.
National Debt: The total accumulation of all past annual budget deficits and surpluses.
Automatic Stabilizers: Features of modern government budgets (like progressive income taxes and unemployment insurance) that act to dampen the business cycle without explicit legislative action.
Discretionary Fiscal Policy: Deliberate changes in taxes and spending by Congress to stabilize the economy.

Money and Banking

Three Functions of Money:
1. Medium of Exchange: Used for buying and selling goods and services.
2. Unit of Account: A standard yardstick used for measuring the relative worth of goods and services.
3. Store of Value: An asset that allows people to transfer purchasing power from the present to the future.
Monetary Aggregates:
- M1: The most liquid forms of money, including currency and checkable deposits.
- M2: A broader measure including M1 plus near-monies like savings deposits and small time deposits.
Federal Reserve System: The central bank of the United States responsible for controlling the money supply and managing monetary policy.
Tools of the Federal Reserve:
- Open Market Operations (OMO): The buying and selling of government securities to change the money supply.
- Reserve Requirement: The minimum percentage of deposits that banks must keep in reserve.
- Discount Rate: The interest rate the Fed charges on loans it makes to commercial banks.
Expansionary Monetary Policy Effects: By increasing the money supply, the Fed lowers interest rates, which encourages borrowing and spending, ultimately increasing GDP.

Interest Rates

Simple Interest: Interest calculated only on the principal amount of a loan.
Bond Interest Rate: The yield on a bond based on its price and fixed payment.
Formula: $Interest\,Rate = \frac{Annual\,Interest\,Payment}{Bond\,Price}$

Macroeconomic Schools of Thought

Short Run vs. Long Run: Different views on how quickly prices and wages adjust to economic shocks.
Mainstream (Keynesian) Economics: Emphasizes that prices and wages are sticky and that the economy may not automatically correct itself, necessitating government intervention (fiscal and monetary policy) to manage AD.
Monetarism: Associated with Milton Friedman; suggests that the money supply is the primary determinant of short-run economic movements and that government interference often causes instability rather than fixing it.

International Trade

Imports: Goods and services produced abroad and sold domestically.
Exports: Goods and services produced domestically and sold abroad.
Comparative Advantage: The ability of a country to produce a specific good at a lower opportunity cost than its trading partners.
Production Factors:
- Labor-intensive Goods: Products requiring a large amount of labor (e.g., textiles).
- Capital-intensive Goods: Products requiring high levels of machinery and technology (e.g., airplanes).
Exchange Rates: The price of one nation's currency in terms of another nation's currency.
Balance of Payments: A summary of all economic transactions between one country and the rest of the world.
Trade Balance:
- Trade Surplus: When the value of exports exceeds the value of imports.
- Trade Deficit: When the value of imports exceeds the value of exports.

Important Formulas Summary

$Real\,GDP = \left( \frac{Nominal\,GDP}{Price\,Index} \right) \times 100$
$Unemployment\,Rate = \left( \frac{Unemployed}{Labor\,Force} \right) \times 100$
$MPC + MPS = 1$
$Multiplier = \frac{1}{MPS}$
$Bond\,Interest\,Rate = \frac{Annual\,Interest}{Bond\,Price}$
$Real\,GDP\,per\,Capita = \frac{Real\,GDP}{Population}$

Practice and Application Questions

Explain the difference between nominal GDP and real GDP: Nominal uses current prices; Real uses constant (base-year) prices to account for inflation.
Consumer Surplus Calculation: Determine the gap between what someone was willing to pay and what they actually paid.
Substitutes vs. Complements: Identify if an increase in the price of one good raises (substitute) or lowers (complement) the demand for another.
Equilibrium Determination: Finding the price where Quantity Supplied equals Quantity Demanded in a data set.
Unemployment Rate Calculation: Using provided numerical data for the unemployed population and the total labor force.
Multiplier Determination: Calculating the impact of spending based on given $MPC$ or $MPS$ values ( $1/MPS$ ).
Monetary Policy Effects: Describe the chain reaction: $Money\,Supply \uparrow \rightarrow Interest\,Rates \downarrow \rightarrow Investment \uparrow \rightarrow GDP \uparrow$ .
Federal Reserve Tool Identification: Distinguish between OMOs, the reserve ratio, or the discount rate in specific case studies.
Fiscal Policy Identification: Determine if a budget move (e.g., tax cut vs. spending cut) is expansionary or contractionary.
Trade Balance: Define and calculate whether a nation has a surplus or deficit based on import/export values.