 :Often a straight line is used to display demand, but that is incorrect. Think about it practically, if the price is originally $10, if you decrease it by $5, demand might double at the bargain. But if it is decreased down to only $1, demand would increase more than 80%, it would become huge. Imagine if mac cut their prices down to $10, the would be sold out in a day or two. The opposite is also true, that as price increases, demand decreases less each time, because there tends to be a couple of wealthy aristocrats who still want to buy the product. Once again, with the mac example, there's probably at least one millionare out there, who is a mac addict, who would still buy the laptop at $100,000. Because of these relationships, the graph has a curve. Hope that makes sense... (  )  