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INCOME ELASTICITY OF DEMAND: The relative response of a change in demand to a relative change in income. More specifically the income elasticity of demand can be defined as the percentage change in demand due to a percentage change in buyers' income. The income elasticity of demand quantitatively identifies the theoretical relationship between income and demand.

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MARGINAL REVENUE, PERFECT COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly competitive 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 perfectly competitive firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time watching infomercials trying to buy either yellow cotton balls or a set of steel-belted radial snow tires. Be on the lookout for pencil sharpeners with an attitude.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"The art of leadership is saying no, not yes. It is very easy to say yes. "

-- Tony Blair, British prime minister

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