Macroeconomics Midterm Study Guide: Key Concepts and Applications

Chapter 1: Getting Started

Definition of Economics

Economics is the study of how individuals, firms, and societies allocate scarce resources to satisfy unlimited wants.

• Scarcity: The fundamental economic problem of having limited resources to meet unlimited needs.

• Choices: Decisions made to allocate resources efficiently.

• What, How, for Whom: The three basic economic questions: What goods/services to produce? How to produce them? For whom are they produced?

• Opportunity Cost: The value of the next best alternative foregone when making a choice.

• Benefit: The gain or satisfaction received from a choice.

• Marginal Cost: The additional cost incurred from producing one more unit.

• Marginal Benefit: The additional benefit received from consuming one more unit.

• Microeconomics vs Macroeconomics: Micro studies individual agents; Macro studies the economy as a whole.

• Positive Economics: Describes and explains economic phenomena ("what is").

• Normative Economics: Prescribes policies or opinions ("what ought to be").

What, How, For Whom

• What: Consumption, capital, government, and export goods.

• How: Production uses land, labor, capital, and entrepreneurship.

• For Whom: Distribution determined by forms of income (wages, rent, interest, profit).

Circular Flow Diagram

The circular flow diagram illustrates the movement of goods, services, and money between households and firms.

• Households provide factors of production to firms and receive income.

• Firms produce goods/services and sell them to households.

Chapter 2: The Economic Problem

Production Possibilities Frontier (PPF)

The PPF shows the maximum combinations of goods/services that can be produced with available resources and technology.

• General Characteristics: Downward sloping, illustrates trade-offs.

• Graphing Specific PPF: Points on the curve are efficient; points inside are inefficient; points outside are unattainable.

• Constant vs Increasing Opportunity Cost: Straight line PPF indicates constant opportunity cost; bowed-out PPF indicates increasing opportunity cost.

Economic Growth

• Growth shifts the PPF outward, allowing more production.

• Current vs Future Production: Investing in capital goods increases future production capacity.

Absolute and Comparative Advantage

• Absolute Advantage: Ability to produce more of a good with the same resources.

• Comparative Advantage: Ability to produce a good at a lower opportunity cost.

Calculating Opportunity Cost

• Opportunity cost of producing one good is the amount of the other good that must be given up.

• Formula: $\text{Opportunity Cost} = \frac{\text{Loss in Good B}}{\text{Gain in Good A}}$

Production and Trade

• Specialization and trade allow countries to consume beyond their own PPF.

• Example: Farmer and Food/Clothing examples illustrate gains from trade.

Chapter 3: Supply and Demand

Competitive Market Conditions

Markets with many buyers and sellers where no single agent can influence price.

Law of Demand

• As price decreases, quantity demanded increases (inverse relationship).

• Quantity Demanded vs Demand: Quantity demanded is a specific amount at a given price; demand is the entire relationship between price and quantity.

Shifts in Demand

• Income: Normal goods (demand increases with income); Inferior goods (demand decreases with income).

• Price of Related Goods: Substitutes (demand increases if price of substitute rises); Complements (demand decreases if price of complement rises).

• Tastes/Preferences: Changes can increase or decrease demand.

• Expectations: Anticipated future prices affect current demand.

• Number of Buyers: More buyers increase demand.

Law of Supply

• As price increases, quantity supplied increases (direct relationship).

• Quantity Supplied vs Supply: Quantity supplied is a specific amount at a given price; supply is the entire relationship.

Shifts in Supply

• Input Prices: Higher input prices decrease supply.

• Productivity/Technology: Improvements increase supply.

• Substitutes/Complements in Production: Changes in profitability affect supply.

• Expectations: Anticipated future prices affect current supply.

• Number of Sellers: More sellers increase supply.

Equilibrium

• Market equilibrium is where quantity demanded equals quantity supplied.

• Equilibrium Price and Quantity: Determined by intersection of supply and demand curves.

• Changes in Equilibrium: Shifts in supply or demand change equilibrium price and quantity.

Shortage and Surplus

• Shortage: Quantity demanded exceeds quantity supplied at current price.

• Surplus: Quantity supplied exceeds quantity demanded at current price.

Price Ceiling and Price Floor

• Price Ceiling: Maximum legal price; can cause shortages.

• Price Floor: Minimum legal price; can cause surpluses.

Chapter 8: GDP

GDP Measures

Gross Domestic Product (GDP) measures the total income, expenditure, and output of an economy.

• Definition: The market value of all final goods and services produced within a country in a given period.

• Included: Final goods/services, domestic production.

• Excluded: Intermediate goods, used goods, financial transactions, transfer payments.

Components of GDP

• Consumption (C): Spending by households.

• Investment (I): Spending on capital goods.

• Government Spending (G): Expenditures by government.

• Net Exports (NX): Exports minus imports.

• Formula: $\text{GDP} = C + I + G + NX$

Nominal and Real GDP

• Nominal GDP: Measured using current prices.

• Formula: $\text{Nominal GDP} = \sum (\text{Current Price} \times \text{Quantity})$

• Real GDP: Measured using constant base-year prices.

• Formula: $\text{Real GDP} = \sum (\text{Base Year Price} \times \text{Quantity})$

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

Business Cycles

• Recession: Period of declining GDP.

• Expansion: Period of rising GDP.

GDP and Well-being

• GDP is an imperfect measure of well-being.

• Issues: Omitted production, environmental impact, leisure, income distribution, happiness.

Chapter 9: Inflation and Unemployment

Inflation

Inflation is the general increase in prices over time.

• Consumer Price Index (CPI): Measures average change in prices paid by consumers.

• Construction Steps:

  1. Fix the basket of goods.

  2. Find prices for each item.

  3. Compute basket cost.

  4. Choose base year.

  5. Calculate CPI: $\text{CPI} = \frac{\text{Current Basket Cost}}{\text{Base Year Basket Cost}} \times 100$

• Inflation Rate Formula: $\text{Inflation Rate} = \frac{\text{CPI}_{t} - \text{CPI}_{t-1}}{\text{CPI}_{t-1}} \times 100$

• Problems: Substitution bias, introduction of new goods, unmeasured quality changes.

• Indexation: Adjusting payments for inflation.

• Nominal vs Real Interest Rates: Nominal is unadjusted; real is adjusted for inflation.

• Formula: $\text{Real Interest Rate} = \text{Nominal Interest Rate} - \text{Inflation Rate}$

• Comparing Values: Use CPI to adjust values across time periods.

Unemployment

• Unemployment Rate: Percentage of labor force that is unemployed.

• Formula: $\text{Unemployment Rate} = \frac{\text{Number of Unemployed}}{\text{Labor Force}} \times 100$

• Current Population Survey: Used to collect labor market data.

• Labor Force: Employed + Unemployed.

• Working Age Population: All individuals aged 16 and over.

• Discouraged Workers: Not actively seeking work; excluded from labor force.

• Labor Force Participation Rate: $\text{LFPR} = \frac{\text{Labor Force}}{\text{Working Age Population}} \times 100$

• Types of Unemployment:

  • Frictional: Short-term, between jobs.

  • Structural: Mismatch of skills and jobs.

  • Cyclical: Due to economic downturns.

• Natural Rate of Unemployment: Unemployment rate when economy is at full employment.

• Determinants: Job search, demographics, unemployment benefits, structural changes.

• Job Rationing: Minimum wage, unions, efficiency wages can increase unemployment.

Type of Unemployment	Description	Example
Frictional	Short-term, between jobs	Recent graduate seeking first job
Structural	Mismatch of skills and jobs	Factory worker displaced by automation
Cyclical	Due to economic downturns	Worker laid off during recession

Additional info: Academic context and formulas have been expanded for clarity and completeness.