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MATERIALS: The stuff used in the production of tangible products that become the tangible products. Materials, also termed raw materials, are part of the land category of scarce resources. Space is also part of the land resource category. Another term that works as a synonym for materials is natural resources. Perhaps it's obvious that without materials, there would be no tangible products.

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FOUR-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.

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APLS

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for malfunctioning pocket calculators.
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A half gallon milk jug holds about $50 in pennies.
"Try not to become a man of success, but rather try to become a man of value. "

-- Albert Einstein

IGARCH
Integrated Generalized Autoregressive Conditional Heteroskedasticity
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