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MARGINAL PRODUCT CURVE: A curve that graphically illustrates the relation between marginal product and the quantity of the variable input, holding all other inputs fixed. This curve indicates the incremental change in output at each level of the variable input. The marginal product curve is one of three related curves used in the analysis of the short-run production of a firm. The other two are total product curve and average product curve. The marginal product curve plays in key role in the economic analysis of short-run production by a firm in large part because economists are generally obsessed with marginal changes in production.

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INTERNAL REVENUE SERVICE

A branch of the Department of Treasury that is responsible for collecting federal income taxes and administering the Internal Revenue Code. The Internal Revenue Service (IRS) is the office of the U.S. government that collects the tax revenue needed to purchase goods, pay administrative expenses, and finance assorted government functions. The IRS was established during the Civil War in 1862, but underwent a major overhaul in 1913 when the 16th amendment to the U.S. Constitution gave it the power to collect income taxes.

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Today, you are likely to spend a great deal of time watching the shopping channel seeking to buy either a 50-foot blue garden hose or a turbo-powered vacuum cleaner. Be on the lookout for infected paper cuts.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"To understand a man, you must know his memories. The same is true of a nation."

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