Demand refers to the relationship between the market price and the desired quantity demanded. Keep in mind the idea of desired quantity demanded. We must consider the quantity that would be demanded
at all prices, not just at today's actual market price. For example,
we might want to know what would happen to the sales of new cars
if the price fell by 10%. Even if this never happens, we can still talk
about how many cars people would like to buy, or the desired quantity demanded if the price fell (or rose) by 10%.
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