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TOTAL FACTOR COST, MONOPSONY: The opportunity cost incurred by a monopsony when using a given factor of production to produce a good or service. This is the total cost associated with the use of a particular resource or factor of production--it is the total cost of the factor. For monopsony, the price paid increases with the quantity purchased and total factor cost increases at an increasing rate. Total factor cost is predominately used in the analysis of the factor market. Two derivative factor cost measures are average factor cost and marginal factor cost.

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FOUR-SECTOR INJECTIONS-LEAKAGES MODEL

A variation of the Keynesian injections-leakages model that adds the foreign sector to the three domestic sectors--the household sector, the business sector, and the government sector. This variation adds the foreign to the three domestic sectors (household, business, and government) in the three-sector model and provides an alternative to the four-sector aggregate expenditures (Keynesian cross). It 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 S + T + M line and the I + G + X line. Two related variations are the two-sector injections-leakages model and the three-sector injections-leakages model.

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Today, you are likely to spend a great deal of time searching for rummage sales wanting to buy either several orange mixing bowls or clothing for your pet dog. Be on the lookout for slightly overweight pizza delivery guys.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
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