Cambridge IGCSE0455

Opportunity cost

Economics 0455 Chapter Notes

What this chapter covers

Opportunity cost - Opportunity costOpportunity cost - The influence of opportunity cost on decision-making
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In this chapter

  1. 1The Basic Economic Problem
  2. 2Defining Opportunity Cost
  3. 3Opportunity Cost for Firms and Governments
  4. 4Visualising Opportunity Cost: The PPC

1. The Basic Economic Problem

At the heart of economics lies a fundamental issue: the basic economic problem. This problem exists because human wants for goods and services are unlimited, but the resources needed to produce them are limited, or finite. This condition is known as scarcity. Because we cannot have everything we want, we are forced to make choices. Economics is the study of how individuals, firms, and governments make these choices to allocate scarce resources to satisfy as many wants as possible. The resources, also known as factors of production, are categorised into four groups: Land (all natural resources), Labour (the human effort used in production), Capital (man-made goods used to produce other goods, like machinery and tools), and Enterprise (the skill and risk-taking of combining the other three factors to produce goods and services).

Key term

Scarcity: The fundamental economic problem of having unlimited human wants in a world with limited resources.

Examiner insight

Examiners reward students who clearly link the concept of scarcity to the necessity of making choices.

Common pitfall

Confusing scarcity with poverty. Scarcity affects everyone, rich or poor, because resources are finite, whereas poverty refers to a lack of personal income or wealth.

Worked example 14 marks

Explain what is meant by 'the basic economic problem'. [4]

  1. 1

    Step 1: State that the basic economic problem is scarcity. This is the core concept.

  2. 2

    Step 2: Define scarcity by explaining that human wants are unlimited, but the resources available to satisfy these wants are limited or finite.

  3. 3

    Step 3: Explain that because of scarcity, choices must be made about how to use the limited resources. For example, a choice has to be made between producing more healthcare or more education.

  4. 4

    Step 4: Conclude by stating that this forces economies to answer three key questions: what to produce, how to produce it, and for whom to produce it.

Recap

  • The basic economic problem is scarcity: unlimited wants versus limited resources.
  • Scarcity forces individuals, firms, and governments to make choices.
  • Resources are also known as factors of production.
  • The four factors of production are Land, Labour, Capital, and Enterprise.
  • Economics studies how we allocate these scarce resources.

Quick check

  1. List the four factors of production.4 marks
  2. In one sentence, what is scarcity?1 mark

2. Defining Opportunity Cost

Every time a choice is made, something is given up. In economics, the true cost of a decision is not just the money paid, but what was sacrificed. This is known as the opportunity cost. Opportunity cost is defined as the benefit lost from the next best alternative that you have to give up when making a choice. For example, if you have £10 and you choose to buy a cinema ticket, you cannot also buy a book that you wanted. If the book was your second-best choice, the opportunity cost of going to the cinema is the enjoyment you would have gained from reading that book. It is the 'opportunity lost'. This concept applies to all economic decisions, from an individual buying a coffee to a government funding a new hospital.

Key term

Opportunity Cost: The value of the next best alternative foregone when an economic decision is made.

Examiner insight

A precise definition is crucial. Simply saying 'what you give up' is too vague; you must specify it is the 'next best' alternative that is 'foregone' or 'sacrificed'.

Common pitfall

Confusing opportunity cost with the monetary price of a choice. The opportunity cost of spending £10 is not the £10 itself, but what else you could have bought with that £10.

Fun fact

The saying 'There's no such thing as a free lunch' is a famous expression of opportunity cost. Even if you don't pay money for the food, you are giving up your time, which could have been used for something else.

Worked example 12 marks

A student has saved $50. They can either buy a new video game or a pair of jeans. They decide to buy the video game. What is the opportunity cost of their decision?

  1. 1

    Step 1: Identify the choice made. The student chose to buy the video game.

  2. 2

    Step 2: Identify the alternative that was given up. The student gave up the chance to buy the pair of jeans.

  3. 3

    Step 3: State the opportunity cost. The opportunity cost is the benefit or satisfaction the student would have received from owning the pair of jeans, as this was the next best alternative foregone.

Worked example 21 mark

According to the meaning of opportunity cost, what is sacrificed when a decision is taken? A. An identical alternative B. Any alternative C. The least valuable alternative D. The next best alternative

  1. 1

    Step 1: Recall the definition of opportunity cost. It is the benefit lost from the 'next best' alternative.

  2. 2

    Step 2: Evaluate the options. 'Any alternative' is incorrect because you only give up one. 'Identical' and 'least valuable' are also incorrect by definition.

  3. 3

    Step 3: Select the correct option. The correct answer is D, as opportunity cost specifically refers to the next best alternative.

Recap

  • Opportunity cost is the benefit lost from the next best alternative foregone.
  • It arises because of scarcity and the need to make choices.
  • The opportunity cost is not the money paid, but the alternative good or service you could have had.
  • Every economic decision has an opportunity cost.

Quick check

  1. A farmer can grow wheat or potatoes on his land. He chooses to grow wheat. What is the opportunity cost?1 mark

3. Opportunity Cost for Firms and Governments

The concept of opportunity cost is critical for understanding the decisions made by producers (firms) and governments. A firm with a factory might have to choose between producing Product A or Product B. If it chooses to produce Product A, the opportunity cost is the profit it could have earned from producing Product B. Similarly, governments have a limited budget raised from taxes. If a government decides to spend $10 billion building new motorways, it cannot use that same money for other projects. The opportunity cost is the next best public service that was foregone, such as building 100 new schools or funding thousands of hospital beds. This forces governments to make difficult choices about resource allocation to maximise social welfare.

Key term

Resource Allocation: The process of assigning and managing scarce resources to particular uses to meet various objectives.

Examiner insight

For questions on government spending, high-scoring answers provide specific and realistic examples of the service foregone (e.g., 'building 50 new primary schools') rather than vague statements like 'spending on other things'.

Worked example 14 marks

Explain why an increase in government spending on police and armed forces may result in an opportunity cost. [4]

  1. 1

    Step 1: Define opportunity cost as the benefit lost from the next best alternative foregone.

  2. 2

    Step 2: State that government revenue is finite. Therefore, choosing to spend more in one area means less is available for other areas.

  3. 3

    Step 3: Give a specific example of an opportunity cost. If the government spends more on police, it may have to cut spending on another public service, such as education. The opportunity cost is the benefit lost from the reduced education spending (e.g., fewer new schools or teachers).

  4. 4

    Step 4: Conclude by linking back to the question. The opportunity cost arises because the resources (money, labour) used for the police and armed forces cannot simultaneously be used for another purpose like healthcare or infrastructure.

Recap

  • Firms face an opportunity cost when deciding which goods or services to produce.
  • Governments face an opportunity cost when allocating their budget.
  • The opportunity cost of a government project is the next best public service that was given up.
  • These decisions are about resource allocation.

Quick check

  1. A car manufacturer decides to produce more SUVs. What is the likely opportunity cost for the firm?2 marks

4. Visualising Opportunity Cost: The PPC

The Production Possibility Curve (PPC), also known as the Production Possibility Frontier (PPF), is a powerful tool for illustrating opportunity cost. It is a graph that shows the maximum possible combinations of two goods that can be produced by an economy, given its available resources and technology are fully and efficiently employed.

  • Points on the curve: Represent an efficient use of resources. To produce more of one good, you must produce less of the other.
  • Points inside the curve: Represent an inefficient use of resources or unemployment. More of both goods could be produced.
  • Points outside the curve: Are unattainable with current resources and technology.

Moving from one point to another *along* the curve demonstrates opportunity cost. For example, to increase the production of Good X, the economy must shift resources away from producing Good Y. The amount of Good Y that is given up is the opportunity cost of producing more of Good X.

Opportunity Cost of producing more of Good X = Loss in Good Y / Gain in Good X

Key term

Production Possibility Curve (PPC): A curve showing the maximum combinations of two goods that can be produced in an economy with its existing resources and technology.

Common pitfall

Confusing a movement *along* the PPC with a *shift* of the entire curve. A movement along the curve shows a reallocation of existing resources (opportunity cost), while a shift of the whole curve shows a change in the total amount of resources or technology (economic growth or contraction).

Worked example 12 marks

A firm can produce either 500 of good X and 300 of good Y, or 600 of good X and 250 of good Y. What is the opportunity cost of producing an extra 100 of good X?

  1. 1

    Step 1: Identify the change in production of good X. Production increases from 500 to 600, which is a gain of 100 units.

  2. 2

    Step 2: Identify the corresponding change in production of good Y. Production decreases from 300 to 250, which is a loss of 50 units.

  3. 3

    Step 3: State the opportunity cost. To produce the extra 100 units of good X, the firm had to give up producing 50 units of good Y. Therefore, the opportunity cost is 50 units of good Y.

Worked example 22 marks

An economy's PPC for wheat and barley is shown in a diagram. To increase the output of wheat from 300 tonnes to 400 tonnes, the output of barley must fall from 800 tonnes to 680 tonnes. What is the opportunity cost of this change?

  1. 1

    Step 1: Identify the gain in wheat production. The increase is 400 - 300 = 100 tonnes of wheat.

  2. 2

    Step 2: Identify the loss in barley production. The decrease is 800 - 680 = 120 tonnes of barley.

  3. 3

    Step 3: State the opportunity cost. The opportunity cost of producing an extra 100 tonnes of wheat is the 120 tonnes of barley that can no longer be produced.

Recap

  • The PPC shows the maximum output combinations of two goods with available resources.
  • Points on the curve are efficient, inside are inefficient, and outside are unattainable.
  • Moving along the PPC illustrates the concept of opportunity cost.
  • The opportunity cost is what is given up (on the Y-axis) to gain more of something else (on the X-axis).
  • An outward shift of the PPC represents economic growth.

Quick check

  1. What does a point inside the PPC represent?1 mark
  2. If a PPC shifts outwards, what does this signify?1 mark

End-of-chapter exercise

Test yourself on the whole chapter. Work through these before moving on.

  1. Define 'opportunity cost' and give a specific example related to an individual's choice. [3]3 marks
  2. Explain the difference between scarcity and poverty. [4]4 marks
  3. A government has a budget of $50 billion. It can spend it all on healthcare, providing 1 million treatments, or all on education, building 500 new schools. It decides to build 200 new schools. Assuming a constant opportunity cost, how many healthcare treatments can it now provide and what is the opportunity cost of its decision? [5]5 marks
  4. Describe the four factors of production required to produce a wooden chair. [4]4 marks
  5. Why is the concept of opportunity cost irrelevant for a good that is not scarce? [3]3 marks
  6. An economy produces capital goods and consumer goods. Using a Production Possibility Curve (PPC), show the effect of a major earthquake that destroys factories and infrastructure. Explain your diagram. [5]5 marks
  7. Discuss the opportunity costs for a 16-year-old student of choosing to stay in full-time education instead of taking a full-time job. [6]6 marks
  8. A company invests $2 million in a new factory. It could have used the money to upgrade its existing IT systems, which it estimated would increase profits by $300,000 per year. Explain the opportunity cost of the company's decision. [4]4 marks
  9. An economy's production possibilities for rice and cloth are shown in the table below. | Combination | Rice (tonnes) | Cloth (rolls) | |---|---|---| | A | 0 | 50 | | B | 10 | 45 | | C | 20 | 35 | | D | 30 | 20 | | E | 40 | 0 | (a) What is the opportunity cost of increasing rice production from 20 to 30 tonnes? [2] (b) Explain whether this PPC shows increasing or constant opportunity cost. [3]5 marks
  10. 'The best way for a government to deal with scarcity is to print more money.' Discuss whether you agree with this statement. [6]6 marks

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The nature of the basic economic problemFactors of productionProduction possibility curve (PPC) diagramsThe role of markets in allocating resourcesDemandSupply