Notes on Scarcity, Resources, the Economic Method, and the Economic Way of Thinking
Scarcity and the economic way of thinking
Scarcity is the condition in which human wants are forever greater than the available supply of time, goods, and resources. Because of scarcity, we are unable to have as much as we would like; it is impossible to satisfy every desire.
Example of unsatisfied wants to frame the idea: a big home, gourmet meals, designer clothes, clean air, better health care, shelter for the homeless, more leisure time, etc. Nature does not offer the Garden of Eden; there are always limits on what the economy can satisfy.
Wealth does not eliminate scarcity. Regardless of wealth, wishes continue to grow; the rich still desire finer homes, faster planes, larger yachts. Scarcity implies that all individuals, rich or poor, are dissatisfied with their material well-being and would like more.
The same scarcity problem applies to society as a whole. Government, such as Uncle Sam, cannot fund all desired programs (education, highways, police, national defense, social security, etc.). Scarcity is a global fact: life is more dire in less developed regions (South America, Africa, parts of Asia) and more prosperous in North America, Western Europe, and some parts of Asia, but scarcity persists even there.
Because of scarcity, every nation must decide what combination of goods to produce, how much to produce, and who gets the goods and services. These choices have profound social and political implications.
Resources and production: no society has enough resources to produce all the goods and services needed to satisfy all wants.
Resources and factors of production
Resources are the basic inputs used to produce goods and services, also called factors of production. Economists divide resources into three categories: Land, Labor, and Capital.
Land
Land = natural resources provided by nature used in production. Includes inputs above or below the ground, such as forests, minerals (gold, diamonds, oil, coal), wind, and the ocean.
Renewable vs nonrenewable resources
Renewable resources: nature can automatically replace them (e.g., crops, clean air, water, fish in lakes).
Nonrenewable resources: cannot be automatically replaced (e.g., coal, oil, natural gas). There is a fixed stock; substitutes may be required over time.
Land is essential for farming, building factories, refining resources, etc.
Labor
Labor = mental and physical capacity of workers to produce goods and services.
Measured by the number of workers and by the skills or quality of workers.
Differences in education, experience, health, and motivation help explain why nations differ in production capabilities.
Entrepreneurship is a special type of labor: creative ability to seek profits by taking risks and combining resources to produce innovative products.
Entrepreneurship
An entrepreneur seeks profits by starting new businesses, creating new products, or inventing new ways of doing tasks, often by embracing new or existing technologies.
Entrepreneurship is scarce because relatively few people are willing or able to innovate and bear the risk of failure.
Important benefit: entrepreneurship drives economic growth and progress. Example: Levi Strauss became a leading pants maker by identifying a practical need (durable pants for miners) and innovating with copper rivets to strengthen seams.
Levi Strauss narrative: Born in Bavaria, moved to the U.S. during the Gold Rush, started by selling cloth, then created durable pants with rivets, built factories, and earned profits.
Capital
Capital = human-made goods used to produce other goods and services (e.g., factories, machinery, equipment).
Private capital = owned by private entities (factories, offices, robots, vehicles, distribution facilities).
Public or social capital (infrastructure) = provided by government through taxes (roads, bridges, dams, airports, harbors, public universities).
Capital vs money: in economics, capital refers to a factor of production, not money. Money is used to purchase land, labor, or capital, and to buy consumer goods and services; money itself is not capital.
Economics: the study of scarcity and choice
Economics studies how society allocates its scarce resources to satisfy unlimited wants.
It is more than just supply and demand or money and banking; it encompasses the choices we make in the face of scarcity.
Two levels of choices
Macro level: economy-wide decisions and policies (inflation, unemployment, economic growth, money supply, national income).
Micro level: decisions by individuals, households, firms, industries, or levels of government (e.g., ostrich eggs market).
Relationship between macro and micro: micro changes aggregate to macro changes, and macro changes affect micro units.
The economic method (problem solving process)
Steps in problem solving in economics:
1) Problem identification: define the issue and the question to be investigated.
2) Model development: build a model that explains and predicts relationships between variables. A model is a simplified description of reality; the terms model and theory are interchangeable.
3) Testing a theory: gather data and test whether the data are consistent with the theory.What a model does
Focuses on the most important variables to explain an event; ignores less relevant details to avoid clutter.
Example: gasoline consumption may depend on price, income, fuel economy, and weather; the theory may state that increases in price reduce quantity demanded (ceteris paribus).
Model examples and explanations
Verbal argument, numerical table, graph, or mathematical equation can express a theory.
A theory is useful only if it yields accurate predictions. If evidence supports X causes Y, the theory is more credible; if not, the theory is rejected.
In the gasoline example, if the price rises and this correlates with a drop in consumption while other factors stay constant, the theory is supported; if other factors change, the conclusion may be misleading.
Pitfalls in the economic way of thinking
Key pitfalls to avoid:
Failing to understand the ceteris paribus assumption (holding other relevant variables constant while analyzing the effect of one variable).
Confusing association (correlation) with causation. A statistical relationship does not prove a cause-and-effect link.
Ceteris paribus: a Latin phrase meaning "all other things being unchanged"; used to isolate the relationship between two key variables by holding others constant.
Examples in practice
Gasoline: assume changes in income or vehicle efficiency do not complicate the analysis; examine the relationship between price and quantity demanded.
Coca-Cola price example: if the price rises and demand falls, but in a hot summer some people buy more due to temperature, the model may appear flawed unless temperature is held constant (ceteris paribus).
Association versus causation and the stability of relationships
A valid model shows a stable cause-and-effect relationship over time, not a coincidence that appears in some observations.
Voodoo dance and stock prices example illustrates that correlation does not imply causation; other factors (e.g., changes in interest rates) may be driving prices.
The book emphasizes that the theory that a change in price causes a change in quantity purchased is a valid microeconomic model, and the theory that a change in the money supply affects interest rates is a valid macroeconomic model.
Positive vs normative economics
Positive economics deals with facts and what is true or false about how the economy works; statements are testable and verifiable.
Normative economics involves value judgments about what should be; statements express opinions about what ought to be and cannot be proven true or false by facts alone.
Examples:
Positive: If unemployment rises to 9%, teenage unemployment exceeds 80% (a testable prediction). Data: in 2010 unemployment was 9.6%, teenage unemployment was 25.9%, not 80%—the statement is false in this case, illustrating testing of a positive claim.
Normative: “The government should cut spending” or “health care should be a basic right.” These reflect judgments and policy preferences.
Distinguishing positive and normative analyses helps clarify whether a policy suggestion rests on factual evidence or value judgments.
Why economists disagree
Economists often cite disagreements between positive analyses (fact-based) and normative judgments (value-based).
They may also disagree due to different assumptions, data, or interpretations, even when sharing the economic method.
Commonly cited quotes about disagreement (humor or rhetoric) do not fully capture that economists often agree on many issues (e.g., benefits of free trade, flaws in some health care systems, or that deficit spending can help recovery from recession).
The key distinction is that when disagreements exist, they often stem from differences in positive analysis under different assumptions, or from normative views about what should be done.
Careers in economics
Personal reflection on studying economics and its career relevance: economics can lead to diverse paths beyond academia.
Notable examples of economists who are well-known in other fields (e.g., Mick Jagger studied economics; several U.S. presidents studied economics).
Career paths for economics majors:
Private sector: roles in business firms, management, sales, market analysis; fields include banking, securities, management consulting, computer/data processing, energy, health care, and more.
Government: federal, state, and local government economists who compile national statistics, measure trends, or work on indexes.
Academia: teaching and research; economics education supports problem-solving and analytical skills.
Economics as preparation for other careers: useful for law school, MBA programs, and general problem-solving skills.
Salary signal: economics majors tend to secure strong salary offers after graduation; Exhibit III (referenced in the transcript) shows average yearly salaries for various bachelor’s degrees with 0–5 years of experience (2016–2017).
Notable historical and practical illustrations
Levi Strauss and the founding of a major company: an entrepreneur identified a market need (durable pants for miners), innovated with rivets, hired workers, built factories, and achieved profitability and growth.
The distinction between capital and money emphasized throughout: capital refers to productive assets, while money is the medium of exchange used to acquire capital, land, or labor, or to purchase goods and services.
The macro vs micro lens is reinforced by concrete examples: macro examples include inflation and unemployment effects from money supply changes; micro examples include price changes in specific markets (e.g., ostrich eggs) and consumer responses.
Key definitions and ideas repeated for emphasis
Economics: the study of how society chooses to allocate its scarce resources to satisfy unlimited wants.
Resources (factors of production): Land, Labor, Capital.
Land: natural resources; renewable vs nonrenewable distinction; includes resources above or below ground, e.g., forests, minerals, wind, ocean.
Labor: workforce capacity and skills; leadership and entrepreneurial capability fall under this category.
Capital: human-made tools and structures used to produce goods and services; distinct from money; includes private capital and public/infrastructure capital.
Capital vs money clarification: money purchases land, labor, or capital but is not itself capital.
Scarcity drives two broad classes of economic questions: what to produce, how to produce, and who gets the output.
Macroeconomics vs microeconomics: economy-wide vs individual-unit analysis; they are interconnected.
The economic method: problem identification, model development, testing a theory; the goal is to predict outcomes of changes in variables.
The ceteris paribus assumption: hold everything else constant to isolate the effect of a single variable; essential for clear analysis but must be applied carefully.
Association vs causation: be wary of relying on correlations as evidence of causal links; stable cause-and-effect relationships are needed for model validity.
Positive vs normative economics: testable facts versus value judgments; a useful analysis separates facts from opinions.
The role of models: simplified representations to understand and predict relationships; governed by the guiding principle that theories should be as simple as possible, but not simpler.
Real-world relevance: economics informs policy debates, public choices, and individual decisions; it also intersects with ethics and social considerations about distribution and welfare.