Calculate The Price Elasticity of Demand From The Following Table

Price elasticity of demand measures how sensitive the quantity demanded of a product is to changes in its price. This calculator helps you calculate elasticity from a table of price and quantity data, then explains how to interpret the results.

What is price elasticity of demand?

Price elasticity of demand (PED) is a measure that quantifies how much the quantity demanded of a good or service responds to a change in its price. It's calculated as the percentage change in quantity demanded divided by the percentage change in price.

Elasticity helps businesses understand consumer behavior and make pricing decisions. A high elasticity means consumers are sensitive to price changes, while low elasticity indicates price insensitivity.

Price elasticity of demand is different from price elasticity of supply, which measures how suppliers respond to price changes.

How to calculate price elasticity of demand

To calculate price elasticity from a table of price and quantity data, follow these steps:

Select two points from your price-quantity table that represent a meaningful price change.
Calculate the percentage change in price and quantity between these points.
Divide the percentage change in quantity by the percentage change in price.

Price Elasticity of Demand Formula:

PED = (%ΔQ / %ΔP)

Where:

%ΔQ = Percentage change in quantity demanded
%ΔP = Percentage change in price

The result can be interpreted as:

Elastic (|PED| > 1): Demand is very sensitive to price changes
Unit elastic (PED = 1): Demand is equally sensitive to price changes
Inelastic (|PED| < 1): Demand is not sensitive to price changes

Interpreting elasticity results

The absolute value of elasticity tells you how responsive demand is to price changes:

Elasticity Range	Demand Response	Example Products
\|PED\| > 1	Highly elastic - large quantity changes for small price changes	Soft drinks, luxury goods
0.5 < \|PED\| < 1	Moderately elastic	Fast food, some groceries
\|PED\| < 0.5	Inelastic - small quantity changes for large price changes	Utilities, prescription drugs

Negative elasticity values indicate that when price increases, quantity demanded decreases (normal goods), while positive values indicate that when price increases, quantity demanded increases (Veblen goods).

Worked example

Let's calculate the price elasticity of demand for a product using the following table:

Price ($)	Quantity Demanded
10	100
12	80

Calculate percentage change in price: (12 - 10)/10 × 100 = +20%
Calculate percentage change in quantity: (80 - 100)/100 × 100 = -20%
Calculate elasticity: -20% / 20% = -1

The result of -1 indicates unit elastic demand - a 1% increase in price leads to a 1% decrease in quantity demanded.

FAQ

What is the difference between price elasticity of demand and cross-price elasticity of demand?: Price elasticity of demand measures how quantity demanded changes with changes in its own price, while cross-price elasticity measures how quantity demanded changes with changes in the price of another good.
How do I choose which points to use in my table for calculating elasticity?: Choose points that represent a meaningful price change. Typically, you'll want to compare points that are close together in the table to get a more accurate measure of local elasticity.
Can elasticity be negative?: Yes, negative elasticity occurs with Veblen goods where demand increases as price increases (e.g., luxury items). Most goods have negative elasticity.
What are the limitations of using a table to calculate elasticity?: Table-based calculations assume linear relationships between price and quantity, which may not always be accurate. For more precise measurements, you might need to collect more data points or use statistical methods.