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NEAR-PUBLIC GOOD: A good that's easy to keep nonpayers from consuming, but use of the good by one person doesn't prevent use by others. The trick with a near-public good is that it's easy to keep people away, and thus you can charge them a price for consuming, but there's no real good reason to do so. From an efficiency view, the more people who consume a near-public good, the better off society. This mixture of nearly unlimited benefits and the ability to charge a price means that some near-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 strolling around a discount warehouse buying club hoping to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for neighborhood pets, especially belligerent parrots.
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