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AD CURVE: The aggregate demand curve, which is a graphical representation of the relation between aggregate expenditures on real production and the price level, holding all ceteris paribus aggregate demand determinants constant. The aggregate demand, or AD, curve is one side of the graphical presentation of the aggregate market. The other side is occupied by the aggregate supply curve (which is actually two curves, the long-run aggregate supply curve and the short-run aggregate supply curve). The negative slope of the aggregate demand curve captures the inverse relation between aggregate expenditures on real production and the price level. This negative slope is attributable to the interest-rate effect, real-balance effect, and net-export effect.

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SUBSTITUTION EFFECT

The change in quantity demanded that results because a change in the demand price of a good causes a change in the relative prices, which induces buyers to substitute the purchase of one good for another. This is one of two reasons, or effects, underlying the law of demand and the negative slope of the market demand curve. The other is the income effect.

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A Perfect Picture Of PROFIT

Good news! Manny Mustard, my long-time friend and proprietor of Manny Mustard's House of Sandwiches is having a special on his Deluxe Club Sandwich. Let's drop in for a brief respite -- and lunch. More good news! Manny is bubbling profusely about the vitality of his business. Last month he turned a profit. Yes, that much cherished profit, the goal of business firms, be they large or small. Upon closer inspection Manny's profit calculation might be suffering from an oversight or two. It seems as though Manny neglected to pay himself a wage. Nor did he bother to include any interest expense on the savings he invested in his House of Sandwiches venture. But what the heck, he earned a profit -- didn't he?
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Today, you are likely to spend a great deal of time searching for rummage sales hoping to buy either a New York Yankees baseball cap or several magazines on home repairs. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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