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ABSTRACTION: Simplifying the complexities of the real world by ignoring (hopefully) unimportant details while doing economic analysis. Abstraction is often criticized because it's, well, it's JUST NOT REALISTIC. However, when done correctly (ignoring things that JUST DON'T MATTER), then the pursuit of knowledge is greatly enhanced by abstraction. For example, when travelling cross country along a high-speed interstate highway, a paper road map is a handy tool. It shows towns and cities along the way, the major intersections, rest stop locations, and other important points of interest. However, it ignores unimportant details. It doesn't realistically show the location of every tree, bush, or blade of grass. Why bother? This information won't enhance your road trip.
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COMMON-PROPERTY GOODS Goods characterized by rival consumption and the inability to exclude nonpayers. Common-property goods are one of four types of goods differentiated by consumption rivalry and nonpayer excludability. The other three goods are private (rival consumption and nonpayers can be excluded), public (nonrival consumption and nonpayers cannot be excluded), and near-public (nonrival consumption and nonpayers can be excluded). Nonrival consumption and the ease of excluding of nonpayers means common-property goods cannot be efficiently exchanged through markets and are often overconsumed.
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GRAY SKITTERY
[What's This?]
Today, you are likely to spend a great deal of time browsing through a long list of dot com websites trying to buy either a coffee cup commemorating yesterday or a replacement remote control for your television. Be on the lookout for celebrities who speak directly to you through your television.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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"Progress always involves risk. You can't steal second base and keep your foot on first. " -- Frederick B. Wilcox
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ARIMA
Autoregressive Integrated Moving Average
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