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April 9, 2026 

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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 DEMAND AND MARKET DEMAND

The aggregate demand curve, or AD curve, has similarities to, but differences from, the standard market demand curve. Both are negatively sloped. Both relate price and quantity. However, the market demand curve is negatively sloped because of the income and substitution effects and the aggregate demand curve is negatively sloped because of the real-balance, interest-rate, and net-export effects.

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APLS

BLACK DISMALAPOD
[What's This?]

Today, you are likely to spend a great deal of time at a going out of business sale looking to buy either a birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for door-to-door salesmen.
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This isn't me! What am I?

A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"It is not the mountain we conquer, but ourselves. "

-- Sir Edmund Hillary, Explorer

RGDP
Real Gross Domestic Product
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