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a change in demand is a movement along the demand curve, and a change in quantity demanded is a shift in the demand curve. 3 people found this useful. Edit. Share to: 1  The Job Outlook and Salary Trends for a Cosmetologist Cosmetology is a field with many different opportunities for its professionals.
Elastic demand is when the quantity to price ratio is more than 1. In other words, if the price dropped 10%, and the quantity demanded rose 50%, then the ratio would be .5/.1 = 5. At the other extreme, if the price dropped 10% and the quantity demanded didn't change, then the ratio would be 0/.1 = 0. This is known as being perfectly inelastic. Therefore, inelastic demand occurs when the ratio of quantity demanded to price is between zero (perfectly inelastic) and one (unit elastic).