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We have emphasized several times the importance of the ceteris paribus assumption when exploring the impact of different prices on the quantity demanded: we assume all other influences on the purchase decision are unchanged (at least momentarily). These other influences fall into several broad categories: the prices of related goods; the incomes of buyers; buyer tastes; and expectations about the future. Before proceeding, note that we are dealing with market demand rather than demand by one individual (the precise relationship between the two is developed later in this chapter).
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