Degrees
P = 20 − 2Q
Elasticity (PED)
Revenue: 50
A Old P: Q:
B New P: Q:

Learn by Doing

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Understanding Price Elasticity of Demand

This interactive lesson explores how the Price Elasticity of Demand (PED) changes along a demand curve. The lesson uses the percentage change formula shown below to calculate elasticity.


Price Elasticity of Demand = Percentage Change in Quantity Demanded ÷ Percentage Change in Price


Point A represents the old (initial) point and Point B represents the new point. Move the points to see how price, quantity demanded, percentage changes, and elasticity update in real time.


How to Use the Playground

  • Drag Point A and Point B along the demand curve.
  • Observe how the Price Elasticity of Demand changes in real time.
  • Compare elasticity at different locations on the demand curve.
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