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January 15, 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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INCREASING MARGINAL RETURNS

In the short-run production by a firm, an increase in the variable input results in an increase in the marginal product of the variable input. Increasing marginal returns typically surface when the first few quantities of a variable input are added to a fixed input. This is one of two alternatives for marginal returns. The other is decreasing marginal returns. A related phenomenon for long-run production is increasing returns to scale.

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"My philosophy of life is that if we make up our mind what we are going to make of our lives, then work hard toward that goal, we never lose - somehow we win out."

-- President Ronald Reagan

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!
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Today, you are likely to spend a great deal of time lost in your local discount super center looking to buy either a weathervane with a chicken on top or a flower arrangement with daisies and carnations for your uncle. Be on the lookout for attractive cable television service repair people.
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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.
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