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SOCIAL SECURITY TAX: A tax on wage earnings that's used to fund the Social Security system. In principle, the Social Security tax is divided equally between employer and employee--your share is listed under the FICA heading of your paycheck. In practice, however, employees really end up paying both employee and employer contributes. The reason is that employers need to consider the entire cost of hiring an employee, including wages, fringe benefits, and assorted taxes. The more they pay in these nonwage items, like Social Security taxes, the less they pay in wages. In that the Social security tax is only on earnings, and excludes profit, interest, and rent, it tends to be a regressive tax.

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MARGINAL REVENUE

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius looking to buy either a genuine down-filled comforter or a 200-foot blue garden hose. Be on the lookout for high interest rates.
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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
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LRMC
Long Run Marginal Cost
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