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VARIABLE INPUT: An input whose quantity can be changed in the time period under consideration. This should be immediately compared and contrasted with fixed input. The most common example of a variable input is labor. A variable input provides the extra inputs that a firm needs to expand short-run production. In contrast, 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. This is, by the way, the law of diminishing marginal returns.

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Lesson 13: Aggregate Demand | Unit 2: Doing More Page: 6 of 22

Topic: Investment Expenditures <=PAGE BACK | PAGE NEXT=>

The business sector is the group responsible for investment expenditures.

Investment is the expenditures by the business sector on final goods and services, mainly capital goods like factories and equipment, undertaken in a given time period.

Three specific categories of investment:

  • Fixed structures Buildings, factories, housing.
  • Equipment Machinery and tools.
  • Inventories Raw materials and unsold goods.
Investment is the most volatile of our four expenditures.

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POTENTIAL REAL GROSS DOMESTIC PRODUCT

The total real output (real gross domestic product) that the economy can produce if resources are fully employed. In theory this means that the economy is operating ON the production possibilities frontier. Full employment is generally indicated by achieving what is termed the natural unemployment rate. If the economy is at full employment then actual real gross domestic product is equal to potential real gross domestic product and the actual unemployment rate is equal to the natural unemployment rate. The macroeconomy is thus living up to its potential.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex wanting to buy either a replacement remote control for your television or a replacement nozzle for your shower. Be on the lookout for infected paper cuts.
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Lombard Street is London's equivalent of New York's Wall Street.
"No amount of business school training or work experience can teach what is ultimately a matter of personal character. "

-- Truett Cathy, Chick-fil-A Inc. founder

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