Principles of Microeconomics: Exam 1 Study Guide

Chapter 1: Introduction to Economics

Scarcity and Choices

Scarcity is the fundamental economic problem of having limited resources to meet unlimited wants. This condition forces individuals and societies to make choices and trade-offs.

• Scarcity: The situation in which resources are insufficient to satisfy all human wants.

• Choices and Trade-offs: Because of scarcity, every choice involves giving up something else. For example, spending money on a textbook means less money for entertainment.

Definition of Economics

Economics is the study of how people allocate scarce resources to satisfy their unlimited wants.

• Economics: The science of decision-making under conditions of scarcity.

Three Key Economic Ideas

• People are rational: Individuals use all available information to achieve their goals.

• People respond to incentives: Changes in incentives influence behavior (e.g., higher prices encourage sellers to supply more).

• Optimal decisions are made at the margin: Decisions are made by comparing marginal benefits and marginal costs.

Opportunity Cost

Opportunity cost is the value of the next best alternative foregone when a choice is made.

• Definition: The cost of the best alternative that is not chosen.

• Example: If you spend time studying instead of working, the opportunity cost is the wage you could have earned.

Three Fundamental Economic Questions

Every society must answer:

• What goods and services to produce?

• How to produce the goods and services?

• Who will receive the goods and services?

Economic Organization

Societies organize their economies in different ways:

• Centrally Planned Economies: The government decides what is produced, how, and who receives it (e.g., former Soviet Union).

• Market Economies: Decisions are made by households and firms interacting in markets (e.g., United States).

• Mixed Economies: Features of both market and centrally planned systems (e.g., most modern economies).

Positive vs. Normative Economics

• Positive Economics: Describes and explains economic phenomena ("what is"). Example: "Increasing the minimum wage will increase unemployment among teenagers."

• Normative Economics: Prescribes policies or opinions ("what ought to be"). Example: "The government should increase the minimum wage."

Microeconomics vs. Macroeconomics

• Microeconomics: The study of individual markets, firms, and households. Example: Analyzing the price of coffee.

• Macroeconomics: The study of the economy as a whole, including inflation, unemployment, and economic growth. Example: Studying national unemployment rates.

Chapter 2: Economic Models and Trade

Production Possibilities Frontier (PPF)

The PPF is a curve showing the maximum attainable combinations of two products that may be produced with available resources and technology.

• Assumptions: Fixed resources, fixed technology, only two goods produced.

• Efficient Points: Points on the PPF; all resources are fully utilized.

• Inefficient Points: Points inside the PPF; resources are underutilized.

• Attainable Points: Points on or inside the PPF.

• Unattainable Points: Points outside the PPF; not possible with current resources.

Marginal Opportunity Costs

• Constant Marginal Opportunity Cost: PPF is a straight line; opportunity cost remains the same.

• Increasing Marginal Opportunity Cost: PPF is bowed outward; opportunity cost increases as more of one good is produced.

Factors Shifting the PPF Outward

• Increase in resources (e.g., labor, capital)

• Improvement in technology

Trade Creates Value

Trade allows individuals and nations to specialize in the production of goods for which they have a comparative advantage, increasing overall efficiency and output.

• Example: If one country is better at producing wheat and another at producing cars, both benefit by trading.

Comparative Advantage and Absolute Advantage

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

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

• Identifying Comparative Advantage: Calculate opportunity costs for each producer.

• Gains from Trade: Both parties can consume beyond their individual PPFs by specializing and trading.

Example Calculation:

• If Country A can produce 10 units of wheat or 5 units of cars, and Country B can produce 8 units of wheat or 8 units of cars, calculate opportunity costs to determine comparative advantage.

Free Market and Market System Foundations

• Free Market: An economic system with minimal government intervention, where prices are determined by supply and demand.

• Adam Smith's 'Invisible Hand': The principle that individuals seeking their own gain often benefit society as a whole.

• Fridrich Hayek's Knowledge Problem: The idea that no central planner can possess all the information needed to allocate resources efficiently.

• Private Property Rights: The legal right to own and use resources; essential for market systems.

Chapter 3: Supply and Demand

Demand vs. Quantity Demanded

Demand refers to the entire relationship between price and quantity demanded, while quantity demanded is the specific amount at a given price.

• Law of Demand: As price decreases, quantity demanded increases, ceteris paribus.

• Substitution Effect: Consumers switch to cheaper substitutes when price rises.

• Income Effect: A price change affects consumer purchasing power.

Factors Shifting Market Demand

• Income

• Prices of related goods (substitutes and complements)

• Tastes and preferences

• Population and demographics

• Expected future prices

Change in Demand vs. Change in Quantity Demanded

• Change in Demand: Shift of the demand curve due to factors other than price.

• Change in Quantity Demanded: Movement along the demand curve due to a change in price.

Supply vs. Quantity Supplied

Supply is the entire relationship between price and quantity supplied; quantity supplied is the amount offered at a specific price.

• Law of Supply: As price increases, quantity supplied increases, ceteris paribus.

Factors Shifting Market Supply

• Input prices

• Technology

• Number of sellers

• Expected future prices

Change in Supply vs. Change in Quantity Supplied

• Change in Supply: Shift of the supply curve due to factors other than price.

• Change in Quantity Supplied: Movement along the supply curve due to a change in price.

Market Equilibrium

Market equilibrium occurs where quantity demanded equals quantity supplied.

• Equilibrium Price: The price at which the market clears.

• Equilibrium Quantity: The quantity bought and sold at equilibrium price.

Surplus vs. Shortage

• Surplus: Quantity supplied exceeds quantity demanded; price tends to fall.

• Shortage: Quantity demanded exceeds quantity supplied; price tends to rise.

• Market Adjustment: Prices adjust to eliminate surpluses and shortages, returning to equilibrium.

Effects of Changes in Demand and Supply

Changes in demand or supply shift the respective curves, affecting equilibrium price and quantity.

• Increase in Demand: Raises equilibrium price and quantity.

• Decrease in Demand: Lowers equilibrium price and quantity.

• Increase in Supply: Lowers equilibrium price, raises equilibrium quantity.

• Decrease in Supply: Raises equilibrium price, lowers equilibrium quantity.

Adam Smith's 'Invisible Hand' Principle

Markets coordinate individual actions through price signals, leading to efficient outcomes without central planning.

• Example: If there is a shortage of a good, prices rise, encouraging producers to supply more and consumers to buy less.

Additional info: Academic context and examples were added to clarify brief points and ensure completeness.