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SEC: The abbreviation for Securities and Exchange Commission, which is a federal government agency that regulates the trading of corporate stock to protect investors against unscrupulous practices. Like a number of other federal regulatory agencies, the SEC was established in the 1930s--1934 to be exact. The impetus for its formation was to prevent investors from manipulating the stock market and to prevent other practices that contributed to the 1929 stock market crash. The SEC has all sorts of rules governing the stock market, including information disclosure, insider trading, speculation, and use of credit.

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LONG-RUN AVERAGE COST CURVE, DERIVATION

The long-run average cost curve is the envelope of an infinite number of short-run average total cost curves, with each short-run average total cost curve tangent to, or just touching, the long-run average cost curve at a single point corresponding to a single output quantity. The key to the derivation of the long-run average cost curve is that each short-run average total cost curve is constructed based on a given amount of the fixed input, usually capital. As such, when the quantity of the fixed input changes, the short-run average total cost curve shifts to a new location.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either arch supports for your shoes or an AC adapter that works with your MPG player. Be on the lookout for strangers with large satchels of used undergarments.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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EGARCH
Exponential Generalized Autoregressive Conditional Heteroskedasticity
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