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Introducing the Market

Producer objectives and the supply curve

  • 3 things to know
  • Papers 1 and 3

Overview

Supply and the law of supply, why the supply curve slopes upwards through profit per unit and rising marginal cost, the producer's objectives, market supply, supply over a period of time, perfectly inelastic supply, short-run against long-run responsiveness, loss-making products, and resource allocation.

What you need to know

Answer each one before you reveal it.

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Key term

State the law of supply.

Key term

Why does the supply curve slope upwards, in terms of the profit earned on each unit?

Key term

How does rising marginal cost account for an upward-sloping supply curve?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Define supply.

    Model answer

    Supply is the quantity of a good that producers are willing and able to sell at each price over a given period of time.

  2. 2

    State the law of supply.

    Model answer

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

  3. 3

    Describe the shape of a typical supply curve.

    Model answer

    It slopes upwards from left to right, showing that a higher price is associated with a greater quantity supplied.

  4. 4

    Why does the supply curve slope upwards, in terms of the profit earned on each unit?

    Model answer

    A higher price raises the profit earned on each unit, so existing firms find it worth producing more and new firms are drawn into the market.

  5. 5

    How does rising marginal cost account for an upward-sloping supply curve?

    Model answer

    Extra units cost more to produce as capacity is stretched, so producers need a higher price before they will supply them.

  6. 6

    What is the objective a producer is normally assumed to pursue?

    Model answer

    A producer is normally assumed to maximise profit, the difference between total revenue and total cost.

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