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KONDRATIEFF CYCLE: A cycle of economic activity lasting between 45 and 60 years that acquired the name of the first economist to study it, the Russian economist N. D. Kondratieff. The Kondratieff cycle is somewhat controversial and has been attributed to a number of different causes, including investment in transportation infrastructure. This is one of four separate cycles of macroeconomic activity that have been documented or hypothesized. The other three are Kitchin cycle, Juglar cycle, and Kuznets cycle.

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SIGNALLING

When confronted by asymmetric information, the use of small bits of information, or indicators, that suggest more comprehensive information. Signalling is used by those with more information to reduce the cost of informing those with less information. It is commonly used in markets with adverse selection. Methods of signalling include advertising, brand names, and warranties. A related method is screening.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs wanting to buy either a video game player or an AC adapter that won't fry your computer. Be on the lookout for defective microphones.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"How wonderful it is that nobody need wait a single moment before starting to improve the world."

-- Anne Frank

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