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LUXURY GOOD: In general, a good (or service) that is not essential but makes like more enjoyable. Luxury goods are often more expensive and primarily purchased by people with more wealth and income. Using more precise, technical language, a luxury good exists if the income elasticity of demand is positive and greater than one. In other words, as people receive more income, they devote an increasingly larger share of income to the purchase of luxury goods.

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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 looking for a downtown retail store wanting to buy either a T-shirt commemorating the second moon landing or a coffee cup commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for poorly written technical manuals.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
"Success is going from failure to failure without a loss of enthusiasm. "

-- Winston Churchill, British statesman

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