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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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OPEN ECONOMY

An economy that engages in international trade, especially one that exports goods and services to, and imports goods and services from, other economies that make up its foreign sector. It is "open" in the sense that goods and services flow into and out of the country. The alternative to an open economy is a closed economy, one that does not engage in international trade.

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Today, you are likely to spend a great deal of time driving to a factory outlet wanting to buy either a flower arrangement for that special day for your mother or a New York Yankees baseball cap. Be on the lookout for malfunctioning pocket calculators.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
"Whenever an individual or a business decides that success has been attained, progress stops. "

-- Thomas Watson Jr., IBM executive

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