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 a choice is made.

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

• Marginal Cost: The additional cost incurred from producing one more unit of a good or service.

• Marginal Benefit: The additional benefit received from consuming one more unit of a good or service.

• Microeconomics vs Macroeconomics: Microeconomics studies individual markets and agents; Macroeconomics studies the economy as a whole.

• Positive vs Normative Economics: Positive economics describes 'what is'; normative economics prescribes '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 and services, which households purchase.

Chapter 2: The Economic Problem

Production Possibilities Frontier (PPF)

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

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

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

• Constant vs Increasing Opportunity Cost: Straight PPF implies constant opportunity cost; bowed-out PPF implies 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 foregone.

• 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 between price and quantity.

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 occurs 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.

• Example: Rent control (ceiling), minimum wage (floor).

Chapter 8: GDP

GDP Measures

Gross Domestic Product (GDP) measures income, expenditure, and total 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, new production.

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

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)

• Definition: Measures average change in prices paid by consumers for a market basket of goods/services.

• Construction Steps:

  1. Fix the basket.

  2. Find the prices.

  3. Compute the basket's cost.

  4. Choose a base year and compute the index.

  5. Calculate inflation rate.

• Formula: $\text{CPI} = \frac{\text{Cost of Basket in Current Year}}{\text{Cost of Basket in Base Year}} \times 100$

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

Problems with Measuring Cost of Living

• Substitution Bias: Consumers substitute towards cheaper goods.

• Introduction of New Goods: New products may not be immediately included.

• Unmeasured Quality Changes: Quality improvements may not be fully captured.

Indexation

• Adjusting payments for inflation (e.g., COLA).

Nominal and Real Interest Rates

• Nominal Rate: Stated interest rate, not adjusted for inflation.

• Real Rate: Adjusted for inflation.

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

Comparing Values Across Time

• Use CPI to adjust values for inflation.

• Formula: $\text{Value in Year X} = \text{Value in Year Y} \times \frac{\text{CPI}_X}{\text{CPI}_Y}$

Unemployment

Unemployment measures the share of the labor force without jobs but actively seeking work.

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

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

• Labor Force: Employed + Unemployed (actively seeking work).

• Working Age Population: All individuals above a certain age (usually 16).

• Discouraged Workers: Not counted as unemployed; have stopped looking for work.

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

Types of Unemployment

• Frictional: Short-term, due to job search.

• Structural: Mismatch between skills and jobs.

• Cyclical: Due to economic downturns.

Natural Rate of Unemployment / Full Employment

• Definition: The rate of unemployment when the economy is at full employment (no cyclical unemployment).

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

• Job Rationing: Factors like minimum wage, unions, efficiency wages can increase unemployment above the natural rate.

Example: Minimum wage laws may cause structural unemployment by setting wages above equilibrium.