Basic Principles of Economics

What is Economics?

Economics is the study of how individuals and societies make choices in the face of scarce resources. Scarcity means that resources such as money, time, and natural resources (land, air, water) are limited, requiring people to make decisions about their use.

• Scarce Resources: Limited availability of money, time, and natural resources.

• Definition: Economics is the study of how individuals and societies choose to use the scarce resources that nature and previous generations have provided.

• Example: Choosing how to spend money on clothes, food, or housing.

Opportunity Cost

Every choice involves an opportunity cost, which is the value of the best alternative forgone when a decision is made.

• Definition: Opportunity cost is the best alternative that we forgo when we make a choice.

• Example: The opportunity cost of going to the movies includes both the time and money spent, and it can vary by person.

• Example: The opportunity cost of going to college includes tuition, fees, and the value of time spent, but not costs like rent or food that would be incurred regardless.

Marginalism

Marginalism involves analyzing the additional or incremental costs and benefits arising from a choice or decision.

• Definition: Marginalism is the process of analyzing the additional costs or benefits from a decision.

• Marginal Cost: The cost of one more unit or change (e.g., changing a flight ticket costs $100, not the original $500 ticket).

• Sunk Costs: Costs that have already been incurred and cannot be recovered; they should not affect current decisions.

• Example: Deciding to walk out of a movie should only consider the marginal benefit and cost, not the sunk cost of the ticket.

Efficient Markets

An efficient market is one in which profit opportunities are eliminated almost instantaneously, often summarized by the phrase "there's no such thing as a free lunch."

• Definition: Efficient markets quickly eliminate profit opportunities.

Goals in Economic Decision-Making

Different economic agents have different goals:

• Individuals: Seek happiness (utility).

• Businesses: Seek profits (difference between total revenues and total costs).

• Governments: Seek social welfare.

Recognizing Possibilities

When making choices, it is important to recognize limitations and possibilities, understanding what is feasible given constraints.

Goals of Economic Study

• To better understand society

• To become an informed citizen

• To understand the workings of markets and the consequences of economic policy

Introductory Economic Models

Microeconomics vs. Macroeconomics

Economics is divided into two main branches:

• Microeconomics: Examines the functioning of individual industries and the behavior of firms and households.

• Macroeconomics: Examines aggregate economic behavior, such as income, employment, and output on a national scale.

Fields of Economics

Economics includes various specialized fields, each focusing on different aspects of economic behavior and policy.

• Behavioral Economics: Studies how psychological factors affect economic decisions.

• Comparative Economic Systems: Compares resource allocation in market vs. command systems.

• Econometrics: Uses statistical methods to test economic theories.

• Economic Development: Examines factors influencing growth in developing nations.

• Economic History: Studies historical economic changes and their impacts.

• Environmental Economics: Analyzes the effects of policies like carbon taxes on emissions.

• Finance: Investigates financial markets and their social benefits.

• Health Economics: Studies how costs affect healthcare choices.

• Industrial Organization: Explains market structures and phenomena like price wars.

• Labor Economics: Examines the effects of policies like minimum wage on employment.

Method of Economics: Positive vs. Normative

Economics uses two main approaches:

• Positive Economics: Focuses on describing and explaining economic phenomena without value judgments.

• Normative Economics: Evaluates economic outcomes as good or bad and may prescribe policies; also called policy economics.

Economic Models

Models are formal statements of theories, often mathematical, that describe relationships between variables.

• Model: A formal statement of a theory, usually mathematical.

• Variable: A measure that can change from time to time or from observation to observation.

• Ockham’s Razor: Principle that irrelevant detail should be cut away.

• Ceteris Paribus: Analyzing relationships while holding other variables constant.

Cautions and Pitfalls in Economic Analysis

• Correlation vs. Causation: Sorting out cause and effect is challenging; correlation does not imply causation.

• Post Hoc Fallacy: Assuming that because Event A precedes Event B, A caused B.

• Fallacy of Composition: Assuming what is true for a part is true for the whole.

• Empirical Economics: Collecting and using data to test economic theories.

Factors Informing Value Judgments

Value judgments in economics may be informed by:

• Efficiency: Producing what people want at the least possible cost (allocative efficiency).

• Equity: Fairness, often implying a more equal distribution of income and wealth.

• Growth: Increase in total output of an economy.

• Stability: Steady growth, low inflation, and full employment.

Key Terms and Concepts

• Utility: The satisfaction or happiness derived from consuming goods and services.

• Profit: The difference between total revenues and total costs for a business.

• Social Welfare: The well-being of society as a whole, often a goal for governments.

• Sunk Cost: A cost that has already been incurred and cannot be recovered.

• Marginal Benefit: The additional benefit from consuming or producing one more unit.

• Marginal Cost: The additional cost from consuming or producing one more unit.

Formulas and Equations

• Profit:

• Opportunity Cost:

• Marginal Cost:

• Marginal Benefit:

Comparison Table: Microeconomics vs. Macroeconomics

Additional info: Academic context was added to clarify definitions, provide examples, and expand on brief points for completeness.