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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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PER UNIT TAX

A tax specified as a percentage of the quantity of a good, service, asset, or other activity. Per unit taxes are often imposed on specific goods or markets. A common per unit tax is that levied on gasoline. People pay a given tax for each gallon of gasoline purchased, regardless of the price of gasoline. An alternative is an ad valorem tax, with is a tax specified as a percentage of the value or price of a good.

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APLS

GRAY SKITTERY
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Today, you are likely to spend a great deal of time at an auction seeking to buy either a bottle of blackcherry flavored spring water or a travel case for you toothbrush. Be on the lookout for crowded shopping malls.
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
"We may affirm absolutely that nothing great in the world has been accomplished without passion."

-- Hegel

GARCH
Generalized Autoregressive Conditional Heteroskedasticity
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