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AGGLOMERATION ECONOMIES: A reduction in production cost the results when related firms locate near one another. Firms can be related as competitors in the same industry, by using the same inputs, or through providing output to the same demographic group. The fashion industry, for example, experiences agglomeration economies because they can share specialized inputs (photographers, models) that would be too expensive to employ full time. Retail stores have agglomeration economies when located in shopping malls because they have access to a large group of potential customers with lower advertising cost. Agglomeration economies is given as one of the primary reasons for the emergence of urban areas.

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FOUR-SECTOR KEYNESIAN MODEL

A Keynesian model of the macroeconomy that includes all four macroeconomic sectors, the household sector, the business sector, the government sector, and the foreign sector. This Keynesian model variation adds the foreign to the three domestic sectors (household, business, and government) in the three-sector model. This model provides the complete Keynesian representation of the macroeconomy, including the export-import interaction between the domestic economy and the foreign sector. Equilibrium is identified as the intersection between the C + I + G + (X - M) line and the 45-degree line. Two related variations are the two-sector Keynesian model and the three-sector Keynesian model.

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BLUE PLACIDOLA
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Today, you are likely to spend a great deal of time at the confiscated property police auction trying to buy either a T-shirt commemorating the second moon landing or a coffee cup commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for defective microphones.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"Success is more a function of consistent common sense than it is of genius. "

-- An Wang, industrialist

WLLN
Weak Law of Large Numbers
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