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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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THREE-SECTOR INJECTIONS-LEAKAGES MODEL

A variation of the Keynesian injections-leakages model that includes the three domestic sectors--the household sector, the business sector, and the government sector. This model provides an alternative to the three-sector aggregate expenditures (Keynesian cross) analysis of government stabilization policies, especially how fiscal policy changes in government purchases and taxes can be used to close recessionary gaps and inflationary gaps. Equilibrium is identified as the intersection between the S + T line and the I + G line. Two related variations are the two-sector injections-leakages model and the four-sector injections-leakages model.

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Today, you are likely to spend a great deal of time driving to a factory outlet wanting to buy either a birthday greeting card for your mother that doesn't look like a greeting card or a handcrafted spice rack. Be on the lookout for gnomes hiding in cypress trees.
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