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PERFECT COMPETITION: An ideal market structure characterized by a large number of small firms, identical products sold by all firms, freedom of entry into and exit out of the industry, and perfect knowledge of prices and technology. This is one of four basic market structures. The other three are monopoly, oligopoly, and monopolistic competition. Perfect competition is an idealized market structure that's not observed in the real world. While unrealistic, it does provide an excellent benchmark that can be used to analyze real world market structures. In particular, perfect competition efficiently allocates resources.

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TWO-SECTOR, TWO-MARKET CIRCULAR FLOW

A simple circular flow model of the macroeconomy containing two sectors (business and household) and two markets (product and factor) that illustrates the continuous movement of the payments for goods and services between producers and consumers. The payment flow between the two sectors and two markets is conveniently divided into four segments representing consumption expenditures, gross domestic product, factor payments, and national income. More advanced models containing additional flow segments are two-sector, three-market circular flow; three-sector, three-market circular flow; and four-sector, three-market circular flow.

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APLS

BLACK DISMALAPOD
[What's This?]

Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club trying to buy either a case of blank recordable DVDs or a pair of red goulashes with shiny buckles. Be on the lookout for defective microphones.
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This isn't me! What am I?

Natural gas has no odor. The smell is added artificially so that leaks can be detected.
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."

-- Mark Twain

IGARCH
Integrated Generalized Autoregressive Conditional Heteroskedasticity
A PEDestrian's Guide
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