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MARKET SHARE: The fraction of an industry's total sales accounted for by a single business. In general, market share is a "first-guess" indicator of a firm's market control. If, for example, a company has a market share of 100 percent (that is, a monopoly), then you can rest assured it has a substantial amount of market control. A company with a 25 percent market share has less, but still notable, market control. In fact, when you get right down to the bottom line, the phrase "market share" is only worth mentioning for oligopolistic firms with a significant degree of market control. There really is no market control for a monopolistically competitive firm with a 0.00000001 percent market share.

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INFERIOR GOOD

A good for which a change in income causes an opposite change in demand. That is, an increase in income causes a decrease in demand and a decrease in income causes an increase in demand. The income elasticity of demand for an inferior good is negative. An inferior good is one of two alternatives falling within the buyers' income demand determinant. The other is a normal good.

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Today, you are likely to spend a great deal of time wandering around the shopping mall looking to buy either a birthday gift for your aunt or a pair of leather sandals that won't cause blisters. Be on the lookout for high interest rates.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
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