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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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MARKET ADJUSTMENT

The economic analysis of changes in market equilibrium caused by changes in any of the five demand determinants and/or the five supply determinants. Market adjustment comes in one of eight varieties, given that the two curves comprising the market (demand curve and supply curve) can either increase or decrease, individually or simultaneously. Four adjustments involve a shift of EITHER the demand curve OR the supply curve. The other four adjustments involve shifts of BOTH the demand curve AND the supply curve.

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Today, you are likely to spend a great deal of time driving to a factory outlet looking 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 the last item on a shelf.
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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.
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."

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BJE
Bell Journal of Economics
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