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PERFECT COMPETITION, LONG-RUN PRODUCTION ANALYSIS: In the long run, a perfectly competitive firm adjusts plant size, or the quantity of capital, to maximize long-run profit. In addition, the entry and exit of firms into and out of a perfectly competitive market guarantees that each perfectly competitive firm earns nothing more or less than a normal profit. As a perfectly competitive industry reacts to changes in demand, it traces out positive, negative, or horizontal long-run supply curve due to increasing, decreasing, or constant cost.

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AGGREGATE DEMAND AND MARKET DEMAND

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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Today, you are likely to spend a great deal of time at a going out of business sale looking to buy either a small palm tree that will fit on your coffee table or several magazines on fashion design. Be on the lookout for deranged pelicans.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"You don't have to see the top of the staircase to take the first step.¾ "

-- Martin Luther King, civil rights leader

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