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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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PRINCIPLE OF MINIMUM DIFFERENCES

A principle stating that monopolistically competitive firms seek to maintain similarities between products at the same time they promote differences. Similarities enable substitutability, such that one firm can attract the buyers away from other firms. Differences enable uniqueness and market control, such that each firm has market control and is able to charge a higher price than achieved with perfect competition. This principle is also termed Hotelling's paradox.

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Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either a flower arrangement for that special day for your mother or a New York Yankees baseball cap. Be on the lookout for pencil sharpeners with an attitude.
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