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IMPERFECT COMPETITION: Any markets or industries that do not match the criteria for perfect competition. The key characteristics of perfect competition are: (1) a large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology. These four characteristics are essentially impossible to match in the real world.

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SURVEY WEEK, CURRENT POPULATION SURVEY

The calendar week (Sunday through Saturday) containing the 19th day of the month that is used to conduct the Current Population Survey (CPS). This is the time period in which CPS interviews contact occupants of 60,000 households included in the survey. The survey questions posed by the interviewers then refer to the employment activities of the respondents during the previous calendar week, which is the termed the reference week. The activities of survey respondents during the reference week are the source of information used to estimate the unemployment rate and other employment information generated by the CPS.

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APLS

BROWN PRAGMATOX
[What's This?]

Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway trying to buy either a coffee cup commemorating yesterday or a replacement remote control for your television. Be on the lookout for telephone calls from long-lost relatives.
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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.
"You miss 100% of the shots you never take. "

-- Wayne Gretzky, hockey player

ARCH
Autoregressive Conditional Heteroskedasticity
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