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IMPLICIT COST: An opportunity cost that does NOT involve a money payment or a market transaction. This should be contrasted with explicit cost that DOES involve a money payment or a market transaction. The common misconception among non-economists out there in the real world is that the term "cost" is synonymous with the term "payment," that is, all costs are explicit costs, to be a cost you have to give up some money. Well, I'm here to tell you that this isn't true. Cost is opportunity cost. It's the satisfaction NOT received from activities NOT pursued. It's the value of foregone production. And not all opportunity costs involve a money payment.

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AGGREGATE EXPENDITURES

The total expenditures on gross domestic product undertaken in a given time period by the four sectors--household, business, government, and foreign. Expenditures made by each of these sectors are commonly termed consumption expenditures, investment expenditures, government purchases, and net exports. Aggregate expenditures (AE) are a cornerstone in the study of macroeconomics, playing critical roles in Keynesian economics, aggregate market analysis, and to a lesser degree, monetarism. In particular, aggregate expenditures are combined with the price level as aggregate demand.

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YELLOW CHIPPEROON
[What's This?]

Today, you are likely to spend a great deal of time at a crowded estate auction trying to buy either a brown leather attache case or car battery jumper cables. Be on the lookout for defective microphones.
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This isn't me! What am I?

A communal society, a prime component of Karl Marx's communist philosophy, was advocated by the Greek philosophy Plato.
"When we do the best that we can, we never know what miracle is wrought in our life, or in the life of another."

-- Helen Keller

MPI
Marginal Propensity to Invest
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