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LONG-RUN MARGINAL COST: The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is the increment in the corresponding total. What's most notable about long-run marginal cost, however, is that we are operating in the long run. Unlike the short run, in which at least one input is fixed, there are no fixed inputs in the long run. As such, there is only variable cost. This means that long-run marginal cost is the result of changes in the cost of all inputs.

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PER UNIT TAX

A tax specified as a percentage of the quantity of a good, service, asset, or other activity. Per unit taxes are often imposed on specific goods or markets. A common per unit tax is that levied on gasoline. People pay a given tax for each gallon of gasoline purchased, regardless of the price of gasoline. An alternative is an ad valorem tax, with is a tax specified as a percentage of the value or price of a good.

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Today, you are likely to spend a great deal of time wandering around the shopping mall seeking to buy either a country wreathe or galvanized steel storage shelves. Be on the lookout for broken fingernail clippers.
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Woodrow Wilson's portrait adorned the $100,000 bill that was removed from circulation in 1929. Woodrow Wilson was removed from circulation in 1924.
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