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Foundations and Models in Economics: Chapter 1 Study Notes

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Foundations of Economics

Introduction to Economics

Economics is the study of how societies allocate scarce resources to satisfy unlimited wants. It is divided into two main branches: microeconomics and macroeconomics.

  • Economics: The study of how societies make decisions and choose to allocate scarce resources.

  • Microeconomics: The study of how households and firms make choices and decisions regarding resource allocation.

  • Macroeconomics: The study of the economy as a whole, including topics such as inflation, unemployment, and economic growth.

  • Scarcity: A situation where there are unlimited wants and limited resources, necessitating choices and trade-offs.

Trade-Offs and Opportunity Cost

Understanding Trade-Offs

Scarcity forces individuals and societies to make choices, leading to trade-offs. Every choice involves giving up the next best alternative, known as the opportunity cost.

  • Trade-Off: The act of giving up one benefit in order to gain another, due to limited resources.

  • Opportunity Cost: The highest-valued alternative that must be given up to engage in an activity.

  • Markets are places where buyers and sellers come together to exchange goods and services.

  • Voluntary exchange in markets typically makes both the buyer and seller better off.

Three Basic Principles of Economics

Principles Guiding Economic Decision-Making

Economists identify three core principles that guide the behavior of individuals and firms in making economic decisions:

  1. People are Rational: Economic agents weigh costs and benefits and use all available information to make decisions.

  2. People Respond to Economic Incentives: Changes in incentives influence the choices people make.

  3. Optimal Decisions are Made at the Margin: Agents make decisions such that the marginal benefit (MB) equals the marginal cost (MC) of an activity.

Optimal Decisions at the Margin

Marginal Analysis

Marginal analysis involves comparing the additional benefit and additional cost of an action. The optimal choice is where marginal benefit equals marginal cost.

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

  • Marginal Cost (MC): The additional cost incurred from consuming one more unit of a good or service.

Example: Consider buying glasses of lemonade at $2.00 per glass:

  • Glass 1: MB = $4.00, MC = $2.00 → MB > MC (Buy)

  • Glass 2: MB = $3.00, MC = $2.00 → MB > MC (Buy)

  • Glass 3: MB = $2.00, MC = $2.00 → MB = MC (Optimal point)

  • Glass 4: MB = $1.00, MC = $2.00 → MB < MC (Do not buy)

The Three Fundamental Economic Questions

Questions Every Society Must Answer

All societies must address three fundamental questions due to scarcity:

  1. What will be produced?

  2. How will the goods and services be produced?

  3. Who will receive the goods and services?

Different economic systems answer these questions in different ways:

  • Centrally Planned Economy: The government decides how resources will be allocated.

  • Market Economy: Households and firms interact in markets to allocate resources.

  • Mixed Economy: Most decisions are made by households and firms, but with significant government involvement.

Efficiency and Equity

Productive and Allocative Efficiency

Efficiency and equity are two important goals in economics, but they are not always compatible.

  • Productive Efficiency: Goods and services are produced at the lowest possible cost.

  • Allocative Efficiency: Production is in accordance with consumer preferences, i.e., MB = MC.

  • Equity: Generally considered a "fair" distribution of economic benefits. Note that efficiency does not guarantee equity.

Positive and Normative Analysis

Types of Economic Analysis

Economists distinguish between positive and normative analysis:

Positive Analysis

Normative Analysis

Concerned with what is.

Concerned with what ought to be.

Examples: - An increase in international demand will cause an increase in the price of gasoline. - If the price of iPhones falls, a larger quantity of iPhones will be purchased.

Examples: - We need to develop policies to lower the price of gasoline to make consumers better off. - The government should mandate electric automobiles.

Additional Study Recommendations

  • Learn all definitions from the end of the chapter in your textbook, as these terms are foundational for the rest of the semester.

  • Familiarize yourself with basic algebraic formulas and the discussion of graphs from the appendix.

  • You are responsible for this material and should seek clarification if you have any questions.

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