Overview
This lecture introduced the core concepts of economics, focusing on the economic problem of scarcity, the basic economic resources, types of economics, economic models, variables and relationships, and the difference between positive and normative economic statements.
Introduction to Economics
- Economics is derived from Greek, meaning "household management."
- Economics studies how decisions are made about the use of scarce (limited) resources.
- Scarcity means resources are finite, but human wants are unlimited.
The Economic Problem
- The central economic problem: unlimited wants vs. limited resources.
- Economic agents (households, firms, government) must make choices due to scarcity.
- Needs and wants are both included under "wants" for this topic.
Decision Making and Rational Behavior
- Decisions must be made because time and money are scarce resources.
- Economists assume rational behavior, where people weigh costs and benefits before deciding.
- The term "utility" means satisfaction or benefit gained from a choice.
Economic Resources (Factors of Production)
- Three main resources: land (natural resources), labor (human work), and capital (tools, equipment).
- Land income: rental income; Labor income: wages, salaries, profits; Capital income: interest.
- Capital in economics refers to real (physical) capital, not money.
Branches of Economics
- Microeconomics studies individual choices and markets (e.g., supply, demand, income distribution).
- Macroeconomics looks at the entire economy (e.g., GDP, unemployment, inflation).
Models and Variables in Economics
- Economic models simplify reality to study relationships between variables.
- Variables are factors with measurable values that can change.
- Independent variable causes change; dependent variable is affected by the independent variable.
Types of Relationships
- Inverse relationship: variables move in opposite directions (e.g., higher price, lower quantity demanded).
- Direct relationship: variables move in the same direction (e.g., higher quality, higher demand).
- The assumption ceteris paribus means "all other factors remain constant."
Positive vs. Normative Economics
- Positive economics deals with facts and is testable (can be proven true or false).
- Normative economics is based on opinions or judgments about how things should be.
- Statements can include both positive and normative elements, but should be identified correctly.
Key Terms & Definitions
- Scarcity — limited availability of resources versus unlimited wants.
- Economic Agents — households, firms, and government participants in an economy.
- Utility — the satisfaction or benefit received from a choice.
- Land — natural resources used in production.
- Labor — human effort in the production process.
- Capital — real (physical) goods used to produce other goods and services.
- Microeconomics — the study of individual markets and agents.
- Macroeconomics — the study of the economy as a whole.
- Model — a simplified representation of reality.
- Variable — a factor with measurable values that can change.
- Independent Variable — the variable that causes change in another variable.
- Dependent Variable — the variable affected by another variable.
- Inverse Relationship — variables move in opposite directions.
- Direct Relationship — variables move in the same direction.
- Ceteris Paribus — "all other things being equal" in analysis.
- Positive Statement — factual, testable statement.
- Normative Statement — opinion-based, value judgment statement.
Action Items / Next Steps
- Review and summarize Chapter 1, Section 1.1 in your textbook.
- Prepare for discussion and examples on supply and demand, utility, and economic models in the next class.