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PARETO EFFICIENCY: A type of efficiency that results if one person can not be made better off without making someone else worse off. Named after Vilfredo Pareto, this criterion is the guiding theoretical notion of efficiency used in the study of economics, especially welfare economics. Pareto efficiency is generally not attained if some resources are idle or unemployed. By engaging idle resources in production, some people can have more production without reducing that available to others. A problem with Pareto efficiency, however, is that it is based on the existing distribution of income and wealth. This is one of two noted efficiency criteria used in economics. The other is Kaldor-Hicks efficiency.

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CHANGE IN AGGREGATE DEMAND

A shift of the aggregate demand curve caused by a change in one of the aggregate demand determinants. A change in aggregate demand is caused by any factor affecting aggregate demand EXCEPT the price level. This is one of two changes related to aggregate demand. The other is a change in aggregate expenditures. A change in aggregate demand is comparable to a change in market demand.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club wanting to buy either one of those memory foam pillows or a remote controlled train set. Be on the lookout for broken fingernail clippers.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"Expect people to be better than they are; it helps them to become better. But don't be disappointed when they're not; it helps them to keep trying."

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GARCH
Generalized Autoregressive Conditional Heteroskedasticity
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