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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 RETURNS

The change in the quantity of total product resulting from a unit change in a variable input, holding all other inputs fixed. Marginal returns is an older and more generic term for marginal product. While marginal product has largely replaced marginal returns in most discussions of short-run production, the phrase does persist in a few terms like the law of diminishing marginal returns.

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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either yellow cotton balls or a set of steel-belted radial snow tires. Be on the lookout for the last item on a shelf.
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The New York Stock Exchange was established by a group of investors in New York City in 1817 under a buttonwood tree at the end of a little road named Wall Street.
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