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Unformatted text preview: To find out how many boxes of graham crackers Jim will buy for a given price, extend a perpendicular line from the price on the yaxis to his demand curve. At the point of intersection, extend a line from the demand curve to the xaxis (perpendicular to the x axis). Where it intersects the xaxis (quantity) is how many boxes of graham crackers Jim will buy. For instance, in the graph above, Jim will buy 3 boxes when the price is $2 a box. Aggregate Demand and Horizontal Addition Typically, economists don't look at individual demand curves, which can vary from person to person. Instead, they look at aggregate demand, the combined quantities demanded of all potential buyers. To do this, add the quantities which buyers are willing to buy at different prices. For instance, if Jim and Marvin are the only two buyers in the market for graham crackers, we would add how many they are willing to buy at price...
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 Fall '11
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