Short Answer
Price elasticity of demand is measured by calculating the percentage change in quantity demanded divided by the percentage change in price. It shows how much demand changes when price changes.
If the result is greater than 1, demand is elastic. If it is less than 1, demand is inelastic. This measurement helps in understanding consumer response to price changes.
Detailed Explanation:
Measurement of Price Elasticity of Demand
Formula Method
The most common way to measure price elasticity of demand is by using a formula. This formula compares the percentage change in quantity demanded with the percentage change in price.
This formula gives a numerical value that tells us the degree of elasticity. If the value is more than 1, demand is elastic. If it is less than 1, demand is inelastic. If it is equal to 1, demand is unitary elastic.
Percentage Method
In this method, we calculate the percentage change in both price and quantity demanded. Then we divide the percentage change in quantity by the percentage change in price.
For example, if price increases by 10% and demand decreases by 20%, then elasticity is 2. This shows that demand is elastic.
Total Expenditure Method
Another method to measure price elasticity is the total expenditure or total revenue method. In this method, we observe how total spending changes when price changes.
- If price and total expenditure move in opposite directions, demand is elastic.
- If price and total expenditure move in the same direction, demand is inelastic.
- If total expenditure does not change, demand is unitary elastic.
This method is simple and helps in practical understanding.
Point Method
The point method is used to measure elasticity at a specific point on the demand curve. It is useful when we want to know elasticity at a particular price and quantity.
This method is more technical and is often used in graphs, but it gives accurate results for small changes.
Arc Method
The arc method is used to measure elasticity between two points on a demand curve. It is useful when there is a large change in price and quantity.
It gives an average elasticity between two points, making it more reliable for practical use.
Importance of Measuring Price Elasticity
Better Pricing Decisions
Measuring elasticity helps firms decide whether to increase or decrease prices to maximize profit.
Understanding Demand Behavior
It helps in understanding how consumers react to price changes in different situations.
Business Planning
Firms can plan production and sales strategies based on elasticity values.
Government Use
Governments use elasticity measurement to design tax policies and control prices.
Conclusion
Price elasticity of demand is measured using different methods like formula, percentage, total expenditure, point, and arc methods. These methods help in understanding how demand responds to price changes. Measuring elasticity is important for making better economic decisions.