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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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TOTAL VARIABLE COST AND MARGINAL COST

A mathematical connection between marginal cost and total variable cost stating that marginal cost IS the slope of the total variable cost curve. This relation between total variable cost and marginal cost is also seen with total cost. The slope of the total cost curve is marginal cost, as well. The relation between total variable cost and marginal cost is but another in the long line of applications of the total-marginal relation.

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Today, you are likely to spend a great deal of time at a dollar discount store wanting to buy either a rechargeable battery for your camera or a coffee cup commemorating the first day of spring. Be on the lookout for small children selling products door-to-door.
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North Carolina supplied all the domestic gold coined for currency by the U.S. Mint in Philadelphia until 1828.
"How wonderful it is that nobody need wait a single moment before starting to improve the world."

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