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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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Lesson 11: Circular Flow | Unit 2: Financial Markets Page: 8 of 22

Topic: Saving <=PAGE BACK | PAGE NEXT=>

Saving is a nonconsumption use of income, making a loan or supplying income to the financial markets in exchange for a legal claim.
  • The red financial markets box is a third set of aggregate markets.
  • The green flow is saving supplied to the financial markets. It is income diverted from the household sector.
Why save?
  • To get paid. Interest is the payment for using income.
  • Income is needed later more than now. Income is set aside this year to buy more production next year.
Saving does not disappear, it is income diverted away from the consumption flow and supplied, or loaned, to the financial markets.

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VARIABLE INPUT

An input whose quantity can be changed in the time period under consideration. The most common example of a variable input is labor. Variable inputs provide the means used by a firm to control short-run production. The alternative to variable input is fixed input. A fixed input, like capital, provides the capacity constraint in production. As larger quantities of a variable input, like labor, are added to a fixed input like capital, the variable input becomes less productive, which is the law of diminishing marginal returns.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either a T-shirt commemorating the first day of spring or a coffee cup commemorating last Friday (you know why). Be on the lookout for deranged pelicans.
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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.
"It takes generosity to discover the whole through others. If you realize you are only a violin, you can open yourself up to the world by playing your role in the concert. "

-- Jacques Yves Cousteau, marine explorer

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