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Introducing the Market

Consumer objectives and the demand curve

  • 3 things to know
  • Papers 1 and 3

Overview

Demand and effective demand, the consumer's objective and utility, the law of demand and the shape of the demand curve, the income and substitution effects, diminishing marginal utility, the axes of a demand diagram, market demand, goods whose demand rises with price, and irrational consumers.

What you need to know

Answer each one before you reveal it.

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Key term

What does a consumer try to achieve, and what shape does that give the demand curve?

Key term

Distinguish between a want and effective demand.

Key term

What is the main objective of a consumer in economic theory?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is meant by demand in economics?

    Model answer

    Demand is the quantity of a good that consumers are willing and able to buy at each price over a given period of time.

  2. 2

    Distinguish between a want and effective demand.

    Model answer

    Effective demand is a desire backed by the willingness and the ability to pay, whereas a want with no purchasing power behind it is not demand at all.

  3. 3

    What is the main objective of a consumer in economic theory?

    Model answer

    A consumer aims to maximise utility, the satisfaction gained from the goods and services bought with a limited income.

  4. 4

    Define utility.

    Model answer

    Utility is the satisfaction or benefit a consumer derives from consuming a good or service.

  5. 5

    State the law of demand.

    Model answer

    Other things being equal, as the price of a good rises the quantity demanded falls.

  6. 6

    Describe the shape and slope of a typical demand curve.

    Model answer

    It slopes downwards from left to right, showing that a lower price is associated with a higher quantity demanded.

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