Fundamental Principles and Concepts in Microeconomics

Scarcity and Economics

Scarcity

Scarcity refers to the limited nature of society's resources, which means that not all wants and needs can be satisfied. This fundamental concept underpins all of economics.

• Definition: Scarcity is the condition in which resources are insufficient to produce all goods and services people wish to have.

• Implication: Societies must make choices about how to allocate resources efficiently.

Economics

Economics is the study of how society manages its scarce resources. It examines how resources are allocated among competing uses and how these decisions affect individuals and society as a whole.

• Microeconomics: Focuses on the behavior of individual households and firms and how they interact in markets.

• Macroeconomics: Studies the economy as a whole, including issues like inflation, unemployment, and economic growth.

Two Big Economic Questions

1. What, How, and For Whom?

Economists seek to answer three fundamental questions regarding the production and distribution of goods and services:

• What: What goods and services should be produced?

• How: How should these goods and services be produced?

• For Whom: Who gets the goods and services produced?

What?

• In Canada, agriculture accounts for 2% of total production, manufactured goods for 28%, and services for 70% (including retail, healthcare, education, etc.).

• In Ethiopia, agriculture accounts for 35%, manufactured goods for 21%, and services for 44%.

• Key Point: The wealthier the country, the higher the share of services. As countries become poorer, they rely more on agriculture.

How?

• Factors of Production: Goods and services are produced using productive resources, categorized as:

  • Land: Natural resources used in production.

  • Labour: Human effort, both physical and mental, used in production.

  • Capital: Tools, instruments, machines, buildings, and other constructions used to produce goods and services.

  • Entrepreneurship: The human resource that organizes land, labour, and capital to produce goods and services.

For Whom?

• Distribution depends on income, which is determined by the ownership and use of factors of production.

Factors of Production

Land

• "Gifts of nature" used to produce goods and services.

Labour

• Work time and effort people devote to producing goods and services.

• The quality of labour depends on human capital (knowledge and skills from education, training, and experience).

Capital

• Physical tools, instruments, machines, buildings, and other constructions used in production.

Entrepreneurship

• The human resource that organizes land, labour, and capital.

Self-Interest vs. Social Interest

Self-Interest

Choices that individuals think are best for themselves.

Social Interest

Choices that are best for society as a whole. Social interest is often evaluated in terms of:

• Efficiency: Achieving the maximum benefit from scarce resources.

• Equity: Fairness in the distribution of economic prosperity among members of society.

Efficiency and Social Interest

• Efficiency is achieved if it is not possible to make someone better off without making someone else worse off.

• Equity is subjective and societies have different views on what is fair.

• Fair shares and social interest require "fair shares"—a deeply held value.

How People Make Decisions

Principle #1: People Face Tradeoffs

• "There ain't no such thing as a free lunch." Choosing one thing usually means giving up something else.

Principle #2: The Cost of Something Is What You Give Up to Get It (Opportunity Cost)

• Opportunity Cost: The value of the next best alternative that must be forgone to obtain something.

$\text{Opportunity Cost} = \text{Value of Next Best Alternative}$

Principle #3: Rational People Think at the Margin

• Rational people systematically and purposefully do the best they can to achieve their objectives, making decisions by comparing marginal benefits and marginal costs.

Principle #4: People Respond to Incentives

• Behavior changes when costs or benefits change.

Markets and Economic Organization

Principle #5: Trade Can Make Everyone Better Off

• Trade allows countries to specialize in what they do best and to enjoy a greater variety of goods and services.

Principle #6: Markets Are Usually a Good Way to Organize Economic Activity

• Market Economy: An economy that allocates resources through the decentralized decisions of many firms and households as they interact in markets for goods and services.

Principle #7: Governments Can Sometimes Improve Market Outcomes

• Governments are needed to enforce property rights and intervene in the economy to promote efficiency and equity.

• Property Rights: The ability of an individual to own and exercise control over scarce resources.

• Market Failure: A situation in which a market left on its own fails to allocate resources efficiently.

• Externality: The impact of one person's actions on the well-being of a bystander.

• Market Power: The ability of a single economic actor (or small group) to have a substantial influence on market prices.

Summary Table: Factors of Production

Factor	Description	Example
Land	Natural resources used in production	Farmland, minerals
Labour	Human effort in production	Factory workers, teachers
Capital	Physical tools and equipment	Machinery, computers
Entrepreneurship	Organization and risk-taking	Business founders, innovators

Summary Table: Principles of Economics

Principle	Description
Tradeoffs	Choosing one thing means giving up another
Opportunity Cost	Cost of the next best alternative forgone
Marginal Thinking	Decisions made by comparing additional benefits and costs
Incentives	People respond to changes in costs and benefits
Trade	Can make everyone better off
Markets	Usually a good way to organize economic activity
Government	Can sometimes improve market outcomes

Additional info: Some explanations and examples have been expanded for clarity and completeness based on standard microeconomics textbooks.