• Price elasticity of demand is a measure of the change in the consumption of a good with respect to the change in its price.

  • A product is perfectly elastic if price elasticity is infinite (if demand changes significantly even with a minimal price change).
  • if the price elasticity is greater than 1, the product is elastic; if less than 1, it is inelastic.
  • If the price elasticity of a good is 0 (no change in price results in a change in demand), the good is perfectly inelastic.
  • If the price elasticity is exactly 1 (a change in price leads to an equal percentage change in demand), then the elasticity is called unitary.
  • The presence of a substitute product affects its elasticity. If there are no good substitutes and the product is needed, demand will not change when the price rises, making it inelastic.