Principles and Practice of Economics

Introduction to Economics

Economics is a social science that studies how individuals, institutions, and society make choices under conditions of scarcity. It is divided into two main branches: Microeconomics and Macroeconomics.

• Scarcity: The fundamental economic problem of having unlimited wants but limited resources to fulfill those wants.

• Trade-offs: Choosing one option means giving up another; every decision involves trade-offs.

• Opportunity Cost: The value of the next-best alternative that is forgone when a choice is made.

• Economics: The study of the decisions made by individuals, institutions, and society under scarcity.

• Microeconomics: Focuses on the choices of individuals and businesses, including:

  • Prices: How price changes affect supply and demand.

  • Profit: Maximizing profit in different market structures.

  • Operations: Decisions about hiring labor and wage determination.

• Macroeconomics: Studies the economy as a whole, including:

  • Recessions: Causes of economic downturns and booms.

  • Inflation: Effects on interest rates and money supply.

  • Unemployment: Understanding and defining unemployment.

Scarcity and Choices

Scarcity forces individuals and societies to make choices about how to allocate limited resources. Every choice involves trade-offs and opportunity costs.

• Scarcity: Unlimited wants vs. limited resources.

• Trade-offs: Giving up one thing to obtain another.

• Opportunity Cost: The value of the next-best alternative forgone.

Example: Opportunity Cost

• If you attend a baseball game, the opportunity cost includes not only the money spent (ticket and snacks) but also the value of your time that could have been spent elsewhere.

• Correct answer to practice question: c) The total cash spent plus the value of your time

Defining Economics

Economics is best defined as the study of how society manages its scarce resources.

• Correct answer to practice question: d) How society manages its scarce resources

Positive and Normative Statements

Economists distinguish between two types of statements: Positive and Normative.

• Positive Statements: Claims about how the world is. These are descriptive and can be tested or validated.

• Normative Statements: Claims about how the world ought to be. These are prescriptive and reflect opinions or values.

Examples

• "Increasing the minimum wage will reduce employment." (Positive Statement)

• "The government should increase the minimum wage." (Normative Statement)

Normative Statement Keywords

• Should

• Ought

• Better

• Fair

• Desirable

Key Terms and Definitions

• Scarcity: Limited nature of society's resources.

• Trade-off: The act of giving up one benefit to gain another.

• Opportunity Cost: The cost of the next-best alternative.

• Microeconomics: Study of individual and business decision-making.

• Macroeconomics: Study of the economy as a whole.

• Positive Statement: Describes the world as it is.

• Normative Statement: Describes how the world ought to be.

Formulas

• Opportunity Cost Formula: