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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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AVERAGE REVENUE CURVE, PERFECT COMPETITION

A curve that graphically represents the relation between average revenue received by a perfectly competitive firm for selling its output and the quantity of output sold. Because average revenue is essentially the price of a good, the average revenue curve is also the demand curve for a perfectly competitive firm's output.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius seeking to buy either a looseleaf notebook binder or hand lotion, a big bottle of hand lotion. Be on the lookout for small children selling products door-to-door.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"I don't subscribe to the thesis, 'Let the buyer beware,' I prefer the disregarded one that goes, 'Let the seller be honest.'"

-- Isaac Asimov, Author

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