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HHI: The common abbreviation for the Herfindahl-Hirshman index (or the Herfindahl index), which is a measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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AVERAGE PROPENSITY TO CONSUME

The proportion of household income that is used for consumption expenditures. The average propensity to consume (abbreviated APC) is really nothing more than average consumption. Together with the average propensity to save, it indicates how a given level of income is divided between consumption and saving. A related consumption measure is the marginal propensity to consume.

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APLS

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Today, you are likely to spend a great deal of time watching infomercials trying to buy either semi-gloss photo paper that works with your neighbor's printer or a birthday gift for your father that doesn't look like every other birthday gift for your father. Be on the lookout for small children selling products door-to-door.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
"The human race has only one really effective weapon and that is laughter."

-- Mark Twain

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