Price Elasticity Of Demand (PED)
Overview
If a shop raises its price by 10 per cent, does it sell a little less or a lot less? The answer decides whether the price rise makes the firm more money or less. Price elasticity of demand turns that question into a number you can calculate and act on.
In this lesson you will calculate PED from the formula, read its value (from perfectly inelastic to perfectly elastic), draw the matching demand curves, and link elasticity to the revenue a firm earns. By the end you will be able to advise a firm whether raising or cutting price will boost its takings.
Objectives
- calculation of PED using the formula
- interpretation of the significance of the PED value: perfectly inelastic, inelastic, unitary, elastic, perfectly elastic
- drawing and interpretation of demand curve diagrams to show different PED
- main influences on whether demand is elastic or inelastic
- effect of price changes on the amount spent by consumers and revenue raised by firms, shown both in a diagram and as a calculation
- relationship between PED and the amount spent by consumers and revenue raised by firms
- implications of PED for decision-making by consumers, workers, producers/firms and government
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Price Elasticity Of Demand (PED). Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Price elasticity of demand is calculated as: A. % change in price / % change in quantity demanded B. % change in quantity demanded / % change in price C. change in price x change in quantity D. quantity demanded / price Answer: B
- A PED value of 0.3 (ignoring the sign) means demand is: A. elastic B. unitary C. inelastic D. perfectly elastic Answer: C
- A firm with elastic demand wishing to raise its revenue should: A. raise the price B. lower the price C. keep price unchanged D. stop producing Answer: B
- Price rises 10% and quantity demanded falls 5%. The PED is: A. -2 B. -0.5 C. -5 D. -0.05 Answer: B
- A perfectly inelastic demand curve is drawn as: A. horizontal B. flat and downward sloping C. vertical D. upward sloping Answer: C
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