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GROSS PRIVATE DOMESTIC INVESTMENT: Expenditures on capital goods to be used for productive activities in the domestic economy that are undertaken by the business sector during a given time period. This is the official item in the National Income and Product Accounts maintained by the Bureau of Economic Analysis measuring capital investment expenditures. Gross private domestic investment tends to be the least stable of the four expenditures, averaging between 12-18% of gross domestic product.

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FOUR-SECTOR KEYNESIAN MODEL

A Keynesian model of the macroeconomy that includes all four macroeconomic sectors, the household sector, the business sector, the government sector, and the foreign sector. This Keynesian model variation adds the foreign to the three domestic sectors (household, business, and government) in the three-sector model. This model provides the complete Keynesian representation of the macroeconomy, including the export-import interaction between the domestic economy and the foreign sector. Equilibrium is identified as the intersection between the C + I + G + (X - M) line and the 45-degree line. Two related variations are the two-sector Keynesian model and the three-sector Keynesian model.

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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either an instructional DVD on learning to the play the oboe or a small, foam rubber football. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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