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July 3, 2026 

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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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INCOME EARNED BUT NOT RECEIVED

The three types of income earned but not received (IEBNR) by the factors of production are Social Security taxes, corporate profits taxes, and undistributed corporate profits. IEBNR is subtracted from national income to calculate personal income.

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Fact 6: Our Unknown Economy

Dr. Nova Cain, DDS, has her office in the mini-mall just north of city hall. You know the sort of mini-mall. It has a branch of Interstate OmniBank, Smilin' Ted's All-Comers Insurance Agency, an auto parts store, a branch of the public library, and four chiropractors.

Dr. Cain's location near the Shady Valley City Hall is most fortunate. One of my back molars is beginning to shoot sharp pains through my eyeball, into my brain, and out the back of my head. I've been meaning to stop by for a cleaning and check up, but, well, the thought of sharp needles and high-speed drills grinding away large portions of my teeth convinced me that other activities were more important.

Now, however, just as we're trying to trek through the complexities of the economy, that back molar has decided to throb incessantly. It's best if I stop in and let the kind and (hopefully) gentle Dr. Cain check it out.

Guess what? ROOT CANAL!
Tell me more...

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[What's This?]

Today, you are likely to spend a great deal of time flipping through the yellow pages looking to buy either a replacement remote control for your stereo system or a computer that can play video games and burn DVDs. Be on the lookout for telephone calls from former employers.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
"Far and away the best prize that life has to offer is the chance to work hard at work worth doing."

-- Theodore Roosevelt, 26th US president

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