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QUASI-PUBLIC GOOD: A good that is easy to keep nonpayers from consuming, but use of the good by one person does not prevent use by others. Also termed a near-public good,the trick with a quasi-public good is that it is easy to keep people away, and thus you can charge them a price for consuming, but there is no real good reason to do so. From an efficiency view, the more people who consume a quasi-public good, the better off society. This mixture of nearly unlimited benefits and the ability to charge a price means that some quasi-public goods are sold through markets and others are provided by government. For efficiency's sake, none should be sold through markets.

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MARGINAL COST

The change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost (MC) indicates how much total cost changes for a given change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. It is found by dividing the change in total cost (or total variable cost) by the change in output. Marginal cost is one of four cost concepts used in short-run production analysis. The other three are average total cost, average fixed cost, and average variable cost.

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Today, you are likely to spend a great deal of time at a flea market hoping to buy either an ink cartridge for your printer or a rechargeable battery for your camera. Be on the lookout for the happiest person in the room.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
"Experience keeps a dear school, but fools will learn in no other. "

-- Benjamin Franklin

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