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LONG-RUN MARGINAL COST: The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is the increment in the corresponding total. What's most notable about long-run marginal cost, however, is that we are operating in the long run. Unlike the short run, in which at least one input is fixed, there are no fixed inputs in the long run. As such, there is only variable cost. This means that long-run marginal cost is the result of changes in the cost of all inputs.

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INCOME ELASTICITY OF DEMAND

The relative response of a change in demand to a change in income. More specifically the income elasticity of demand is the percentage change in demand due to a percentage change in buyers' income. This notion of elasticity captures the buyers' income demand determinant. Three other notable elasticities are the price elasticity of demand, the price elasticity of supply, and the cross elasticity of demand.

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BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time at an auction hoping to buy either clothing for your kitty cats or a set of luggage without wheels. Be on the lookout for strangers with large satchels of used undergarments.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"The shifts of fortune test the reliability of friends. "

-- Marcus Tullius Cicero, Roman statesman

ERISA
Employee Retirement Income Security Act of 1974
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