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HERFINDAHL-HIRSHMAN 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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AGGREGATE DEMAND

The total real expenditures on final goods and services produced in the domestic economy that buyers are willing and able to undertake at different price levels, during a given time period (usually a year). Aggregate demand, usually abbreviated AD, is an inverse relation between price level and aggregate expenditures. This is one half of the AS-AD (aggregate market) analysis. The other half is aggregate supply. Aggregate demand consists of four aggregate expenditures--consumption expenditures, investment expenditures, government purchases, and net exports--made by the four macroeconomic sectors--household, business, government, and foreign.

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Fact 3: Our Unfair Lives

Across the interstate from the Mega-Mart Discount Warehouse Super Center resides the Shady Valley Central Town Sprawling Hills Shopping Mall -- a prime example of our economy's climate-controlled, suburban shopping phenomenon. Our pedestrian's ramble through the economy would be totally inadequate if we did not spend at least one day strolling past the endless rows of stores with their displays of clothes, shoes, electronics, clothes, luggage, clothes, cheese pretzels, and of course clothes. Our pedestrian trip, however, is not concerned with the products exhibited beyond the stylish glass windows. No, our jumping off point is the gadzillions of people who pass us by, bump into us, get in our way, and generally make our shopping experience comparable to a commuter train during the rush hour.

Those who comprise the shopping crowd are short, tall, young, old, fat, thin, black, white, happy, and sad. More importantly for our present discussion, however, is that some are rich and some are not-so-rich. A few of the wealthier shoppers actually buy the products framed by the picturesque windows that line the air-conditioned quaint mid-way of Shady Valley Central Town Sprawling Hills Shopping Mall. Others must be content to ogle the prominently displayed products or perhaps buy an occasional cheese pretzel.
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Today, you are likely to spend a great deal of time surfing the Internet trying to buy either a birthday gift for your aunt or a pair of leather sandals that won't cause blisters. Be on the lookout for pencil sharpeners with an attitude.
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John Maynard Keynes was born the same year Karl Marx died.
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