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DISINVESTMENT: A drop in the total quantity of capital in the economy because the depreciation of existing capital is greater than investment in new capital. In other words, the capital we have is wearing out faster than we're replacing it with new stuff. This isn't good. At best, it limits economic growth and might even cause the economy's pie to shrink if increases in other resources don't kick in.

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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

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GRAY SKITTERY
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Today, you are likely to spend a great deal of time at an auction wanting to buy either a cell phone case or a pair of designer sunglasses. Be on the lookout for strangers with large satchels of used undergarments.
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
"It is not fair to ask of others what you are unwilling to do yourself. "

-- Eleanor Roosevelt, diplomat, activist

ARCH
Autoregressive Conditional Heteroskedasticity
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