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HERFINDAHL INDEX: 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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BANK RUN

A situation in which a relatively large number of a bank's customers attempt to withdraw their deposits in a relatively short period of time, usually within a day or two. While common throughout the 1800s and early 1900s, government deposit insurance has largely eliminated banks runs in the modern economy. Historically a bank run was prompted by fears that the bank was on the verge of collapse, causing deposits to become worthless. Ironically a bank run often caused the bank to fail. Bank runs were often infectious, leading to economy-wide bank panics and business-cycle contractions.

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Today, you are likely to spend a great deal of time searching for a specialty store wanting to buy either a key chain with a built-in flashlight and panic button or a green and yellow striped sweater vest. Be on the lookout for rusty deck screws.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"It takes generosity to discover the whole through others. If you realize you are only a violin, you can open yourself up to the world by playing your role in the concert. "

-- Jacques Yves Cousteau, marine explorer

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