1.1 Scarcity, Choice and Opportunity Cost

Cambridge International AS Level Economics — 9708


2026 📋 Syllabus Objectives

By the end of this topic, you should be able to:

  1. Explain the fundamental economic problem of scarcity
  2. Explain why choices must be made at all levels — individuals, firms, and governments
  3. Define opportunity cost and explain how it arises from making choices
  4. Explain the three basic questions of resource allocation: what to produce, how to produce, and for whom to produce

Objective 1 — The Fundamental Economic Problem of Scarcity

What is the Fundamental Economic Problem?

Every single country in the world — whether rich or poor — faces the same basic problem in economics. That problem is this:

People's wants are unlimited, but the resources available to satisfy those wants are limited (scarce).

This conflict between unlimited wants and limited resources is called the fundamental economic problem.

Let's break this down carefully.


What Are Resources?

Resources are the inputs — the things used — to produce goods and services. In economics, we call these resources the factors of production (FOP). There are four of them:

FactorWhat it meansExamplesReward earned
LandNatural resources found in or on the earthOil, forests, farmland, gasRent
LabourThe physical and mental effort of peopleTeaching, farming, accountingWages
CapitalHuman-made tools and machines used in productionFactories, computers, machineryInterest
EnterpriseThe ability to take risks and combine the other factors to produce goodsA business owner starting a companyProfit

💡 Key point: All four of these factors of production are scarce — meaning there is a limited amount of them. You cannot have an unlimited supply of farmland, workers, machines, or entrepreneurs. This is why the economic problem exists.


What Are Wants?

Wants are the desires people have for goods and services. Wants are unlimited — they never end. As soon as one want is satisfied, another takes its place.

Think about it this way: once you get a bicycle, you might then want a motorbike. Once you get a motorbike, you might want a car. Once you get a car, you might want a bigger, better car. Wants just keep growing.

Here are some more examples of how wants are unlimited:

  • A student on a small allowance might want a new phone — they cannot afford it right now.
  • A millionaire might want a private jet — even they cannot always afford it immediately.

No matter how much money a person has, there will always be something they want but cannot yet have. This is why economists say wants are unlimited.

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