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♪ [music] ♪ - [Narrator] Economists use similar terms for two things which are quite different: a change in the quantity demanded versus a change in demand. It can be a little confusing, so lets review. A change in quantity demanded refers to a movement along a fixed demand curve -- thats caused by a change in price. A change in demand refers to a shift in the demand curve -- thats caused by one of the shifters: income, preferences, changes in the price of related goods and so on. Lets illustrate the difference with a refreshing example. Well use soda. - [Woman 1] Um, dont you mean pop? - [Man] Thats a coke, yall! - [Woman 2] Actually, soft drink is the most accurate term, so - [Narrator] Fine, well just use sugary, fizzy drinks, okay? First, lets recall a change in the quantity demanded. Suppose the price on sugary, fizzy drinks goes from $3 to $4. What happens? Well, the quantity demanded decreases from 200 to 150. Theres a decrease in the quantity demanded marked by mo