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Economics
The study of how society allocates scarce resources to meet unlimited wants.
Microeconomics
Focuses on individual decision-making and markets, such as households and businesses.
Macroeconomics
Examines the economy as a whole, including growth, inflation, and unemployment.
Trade-offs
To get one thing, you give up another.
Opportunity Cost
The next best alternative forgone.
Rational Thinking
Decisions are made by comparing costs and benefits.
Incentives Matter
People respond to rewards and punishments.
Trade Benefits All
Allows for specialization and greater efficiency.
Markets Organize Activity
Markets allocate resources efficiently through prices.
Government Can Improve Markets
Addresses market failures and promotes equity.
Country's Standard of Living
Depends on production of goods/services.
Prices Rise with Too Much Money
Inflation occurs when more money chases fewer goods.
Trade-off Between Inflation and Unemployment
Short-run choices affect long-run outcomes.
Supply
Entire relationship between price and quantity.
Quantity Supplied (QS)
The specific amount producers will sell at a given price.
Demand
Entire relationship between price and quantity buyers want.
Quantity Demanded (QD)
The specific quantity buyers will purchase at a given price.
Invisible Hand
Market forces guide resources to efficient uses.
Goods
Items satisfying wants.
Bads
Items which people want to avoid.
Scarcity
Limited resources for high demand.
Rarity
Limited in existence, not necessarily in demand.
Market Failures
Causes: Externalities, market power, and lack of information.
Equilibrium
Where demand equals supply.
Surplus
Quantity supplied > Quantity demanded (price above equilibrium).
Shortage
Quantity demanded > Quantity supplied (price below equilibrium).
Circular-Flow Diagram
Shows the flow of money, goods, and services between households and firms.
Production Possibility Frontier (PPF)
Efficient points: On the curve.
Comparative Advantage
Lower opportunity cost.
Absolute Advantage
Produces more of a good overall.
Price Elasticity of Demand
Influenced by availability of substitutes, necessity, etc.
Total Revenue
Price × Quantity.
Substitutes
Goods replacing each other (coffee vs. tea).
Complements
Goods used together (peanut butter and jelly).
Ceteris Paribus
"All else equal" (used in economic models).
Positive Statements
Fact-based (e.g., "Inflation is 5%").
Normative Statements
Opinion-based (e.g., "Inflation should be lower").
Normal Goods
Demand rises with income (e.g., steak).
Inferior Goods
Demand falls with income (e.g., instant noodles).
Price Ceiling
A legal maximum price (e.g., rent control).
Price Floor
A legal minimum price (e.g., minimum wage).
Binding
Causes surpluses.
Non-binding
No effect.
Tax Incidence
Who bears the burden of a tax?
Elasticity of supply and demand
Depends on the elasticity of supply and demand.
GDP (Gross Domestic Product)
Measures all goods and services produced in a country.
GDP Formula
GDP = C + I + G + (X - M)
C
Consumption
I
Investment
G
Government Spending
(X - M)
Net Exports
Real GDP
Adjusted for inflation.
Nominal GDP
Measured in current prices.
CPI (Consumer Price Index)
Measures changes in the price of a basket of goods/services.
PPI (Producer Price Index)
Tracks price changes at the producer level.
Inflation
Rise in the overall price level.
Interest Rates
Nominal Interest Rate: Stated rate.
Real Interest Rate
Adjusted for inflation.
Real Rate Formula
Real Rate = Nominal Rate - Inflation Rate
Unemployment Rate Formula
Unemployment Rate = (Unemployed ÷ Labor Force) × 100
Frictional Unemployment
Short-term, between jobs.
Structural Unemployment
Mismatch of skills/jobs.
Cyclical Unemployment
Due to economic downturns.
Functions of Money
Medium of Exchange: Used to buy/sell goods.
Store of Value
Keeps value over time.
Unit of Account
Measures value.
Commodity Money
Has intrinsic value (e.g., gold).
Fiat Money
Value by government decree (e.g., U.S. dollars).
Money Supply (M1)
Includes currency, demand deposits, and traveler's checks.
Federal Reserve's Mandates
Maximize Employment and Stabilize Prices.
Monetary Policy
Managed by the Federal Reserve (e.g., interest rates).
Fiscal Policy
Managed by the government (e.g., taxes, spending).
Fractional-Reserve Banking
Banks hold only a fraction of deposits and loan the rest.
Federal Reserve Tools
Open Market Operations: Buying/selling bonds.
Discount Rate
Interest rate for loans to banks.
Reserve Requirements
Minimum reserves banks must hold.
Key Rates
Discount Rate: Fed to banks.
Federal Funds Rate
Banks to banks.
Current Federal Reserve Chairperson
Jerome Powell.
Current Treasury Secretary
Janet Yellen.
Current Inflation Rate
~3-4% (approximate, as of recent data).
Current Unemployment Rate
~3.5-4% (approximate, as of recent data).
Import
Goods bought from another country.
Export
Goods sold to another country.
Tariffs
Taxes on imports.
Trade Surplus
Exports > Imports.
Trade Deficit
Imports > Exports.
Net Exports
Another term for trade balance.
Sudden Stop
A sharp drop in demand for a country's assets.
Benefits of Free Trade
Specialization: Countries focus on what they do best.
Increased variety
More choices for consumers.
Lower prices
Competition reduces costs.
Arguments Against Free Trade
Job Losses: Domestic industries may suffer.
National Security
Overdependence on imports for key resources.
Infant Industries
New industries might struggle without protection.
2008 Financial Crisis Leadership
Federal Reserve Chairperson: Ben Bernanke.
Treasury Secretary (2008)
Henry Paulson.
Purchasing-Power Parity (PPP)
Currencies should adjust so the same goods cost the same in different countries.
Example of PPP
If a burger costs $5 in the U.S. and ¥500 in Japan, the exchange rate should be 100 yen/dollar.