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BENEFIT-COST RATIO: The benefit of an activity per dollar of cost. Benefit-cost ratios (or alternatively cost-benefit ratios) are frequently estimated for many forms of government spending, as well as a growing number of business investments. This technique was originally developed to determine if public investment projects, like dams, public parks, highways, etc., were worth doing. The logic is simple -- If benefits are greater than costs, then the project is worthwhile, if they are less, then it isn't.

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ABSTRACTION

Simplifying the complexities of the real world by ignoring (hopefully) unimportant details while doing economic analysis. Abstraction is an essential feature of the scientific method. Hypothesis verification, model construction, and comparative static analysis are not possible without abstraction.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius seeking to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The average bank teller loses about $250 every year.
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Integrated Generalized Autoregressive Conditional Heteroskedasticity
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