The aggregate demand curve, or AD curve, has similarities to, but differences from, the standard market demand curve. Both are negatively sloped. Both relate price and quantity. However, the market demand curve is negatively sloped because of the income and substitution effects and the aggregate demand curve is negatively sloped because of the real-balance, interest-rate, and net-export effects.

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The quiet, peaceful town of Shady Valley has always been a great place for a pedestrian to wander through the workings of the economy. I'm afraid, though, that it's about to end. I've been offered another job -- an opportunity to wander around the streets of the distant mecca of Shady Lane to search out the mysteries of plant pathology. In Shady Lane, the sidewalks are smoother, the crosswalks are better, and the pay is much more lucrative. However, in that Shady Lane is in another time zone and several states away, migration would be my last topic of the day. There's a lot to be gained from this potential relocation of my residence, but it's not without cost. While I ponder this decision, perhaps you can help out by considering the topic of migration.
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Today, you are likely to spend a great deal of time going from convenience store to convenience store hoping to buy either a video camera with stop action features or one of those memory foam pillows. Be on the lookout for the happiest person in the room.
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This isn't me! What am I?

-- Albert Einstein, physicist

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