A change in a commodity's price will inevitably lead to a change in its demand. With the aid of a method called price elasticity, the impact of the modification is quantified.
A perfectly inelastic demand is one in which the quantity demanded does not change in response to a change in the price of the underlying good. The elasticity of demand in this situation is zero.
When a factor impacting demand changes but the price of the good remains constant, there is a change in demand.
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