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VOLUNTARY EXCHANGE: The process of willingly trading one item for another. The emphasis here is on "willingly." Voluntary exchanges are the heart and soul of market transactions, and should be contrasted with the "involuntary" exchanges mandated by government taxes, laws, and regulations. While involuntary government-forced exchanges play an important role in a mixed economy, economists really, really like voluntary market exchanges because they promote economic efficiency.

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MARGINAL REVENUE

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time at a garage sale wanting to buy either a large stuffed brown and white teddy bear or a replacement washer for your kitchen faucet. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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North Carolina supplied all the domestic gold coined for currency by the U.S. Mint in Philadelphia until 1828.
"He, who every morning plans the transactions of the day, and follows that plan, carries a thread that will guide him through a labyrinth of the most busy life."

-- Victor Hugo, Writer

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