Topic 1.1 Notes – Scarcity

1. Scarcity and the Economic Problem

Scarcity exists because wants are unlimited but resources are limited.

A good is scarce if it is:

• Limited (there isn’t enough for everyone to have as much as they want)
• Desirable (people actually want it)

Air is usually not scarce. Clean drinking water in a drought is.

Scarcity applies to:

• Individuals (your time, your money)
• Firms (workers, machinery)
• Governments (tax revenue, land)
• Rich and poor countries alike

Even the United States faces trade-offs like more healthcare vs. more military spending. Time is scarce too. Studying for Macro means giving up something else.

Because of scarcity, every society must answer three questions:

1. What to produce? (consumer goods vs. capital goods, military vs. education)
2. How to produce? (labor-intensive vs. capital-intensive methods)
3. For whom to produce? (who gets the goods and services)

Economics is the study of how societies allocate scarce resources to answer these questions.

Quick grounding:

• Microeconomics looks at individuals and firms.
• Macroeconomics looks at the economy as a whole, which is where this course lives.

2. The Four Factors of Production

These are the economic resources used to produce goods and services.

Land

All natural resources:

• Oil, water, forests, minerals, farmland

Payment = rent

Labor

Human effort, physical and mental:

• Teachers, engineers, construction workers

Payment = wages

Capital

Capital means goods used to produce other goods. It does not mean money.

Physical capital

• Machines, tools, factories, equipment, technology

Human capital

• Education, training, skills, experience

Payment = interest

⚠️ AP trap: Money is not a factor of production. It is a medium of exchange.

Entrepreneurship

The risk-taker and decision-maker who:

• Combines land, labor, and capital
• Innovates and organizes production

Examples you’ll see in textbooks: Henry Ford, Steve Jobs, Bill Gates.
Payment = profit

3. Trade-Offs and Opportunity Cost

Scarcity forces choices. Choices create costs.

Trade-Offs

All the alternatives you give up when you make a decision.

If you choose to work part-time, you give up free time and maybe study time.

Opportunity Cost

The value of the next best alternative.

Only one thing counts. The single best option you didn’t choose.

If you could:

• Work and earn 80 dollars
• Study and improve your test score
• Sleep

If you choose to study, the opportunity cost is the 80 dollars, assuming that was your next best option.

This idea shows up constantly in FRQs. Students often list multiple opportunity costs. The AP graders want the single best alternative.

The rule to remember:

The real cost of something is what you give up to get it.

4. Production Possibilities Curve PPC

The PPC model visually shows scarcity, trade-offs, and full employment.

Here’s the standard model. In this example, one good is on the vertical axis and one good is on the horizontal axis.

Production Possibilities Curve

What It Shows

• All possible combinations of two goods
• Given fixed resources and fixed technology
• Maximum output

Points on the Graph

• On the curve → Efficient, full employment (points like A, B, and C)
• Inside → Inefficient, unemployment or underused resources (like point D during a recession)
• Outside → Currently unattainable (like point F)

Opportunity Cost and the Slope

Moving along the curve means getting more of one good and less of another.

The slope represents opportunity cost. For example, moving from one point on the curve to another requires giving up some of the good on the vertical axis to gain more of the good on the horizontal axis.

The PPC is usually bowed outward because of increasing opportunity cost. Resources are specialized. As you shift more workers into producing one good, you start pulling workers who are better suited for the other good, so you give up more and more of that other good each time.

This model becomes huge later in Unit 1 when we talk about economic growth. Growth shifts the entire PPC outward.

5. Economic Systems

Different systems answer the three economic questions in different ways.

Traditional

• Based on customs and habits
• Seen in subsistence or tribal economies

Command

• Government makes decisions
• Example: Soviet Union, modern North Korea

Market

• Private property
• Decisions made by buyers and sellers
• Based on supply and demand
• Rooted in laissez-faire philosophy

Mixed

• Combination of market and government
• The United States and China are mixed economies

No modern economy is purely market or purely command.