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AD: The abbreviation for aggregate demand, which is the total (or aggregate) real expenditures on final goods and services produced in the domestic economy that buyers would willing and able to make at different price levels, during a given time period (usually a year). Aggregate demand (AD) is one half of the aggregate market analysis; the other half is aggregate supply. Aggregate demand, relates the economy's price level, measured by the GDP price deflator, and aggregate expenditures on domestic production, measured by real gross domestic product. The aggregate expenditures are consumption, investment, government purchases, and net exports made by the four macroeconomic sectors (household, business, government, and foreign).

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Lesson 20: Oligopoly | Unit 2: Structure Page: 8 of 24

Topic: Herfindahl Index <=PAGE BACK | PAGE NEXT=>

  • Sometimes economists prefer a more sophisticated measure of concentration. That measure is the Herfindahl index.

  • The Herfindahl index is a measure of concentration of production or sales activity in an industry that's calculated as the sum of the squares of market shares for each firm.
  • One key difference with concentration ratios is that the Herfindahl index squares market shares before adding them together, whereas concentration ratios add the adjusted market shares.

  • Like concentration ratios, the Herfindahl index ranges for a low, indicating perfect competition, to a high indicating monopoly.

  • The specific range is 0 (perfect competition) to 10,000 (monopoly).


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NET DOMESTIC PRODUCT

The total market value of all final goods and services produced within the political boundaries of an economy during a given period of time, usually a year, after adjusting for the depreciation of capital. Net domestic product, usually abbreviated NDP, is one of five key National Income and Product Accounts measures reported regularly (every three months) by the Bureau of Economic Analysis. The other four measures are gross domestic product, national income, personal income, and disposable income. Net domestic product has largely replaced a comparable term, net national production.

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Today, you are likely to spend a great deal of time at the confiscated property police auction hoping to buy either a video game player or an AC adapter that won't fry your computer. Be on the lookout for crowded shopping malls.
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The average bank teller loses about $250 every year.
"We succeed in enterprises (that) demand the positive qualities we possess, but we excel in those (that) can also make use of our defects."

-- Alexis de Tocqueville, Statesman

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