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OPEN SHOP: An employment arrangement in which workers of a firm are free to join or not join a union because employment is unrelated to union membership. Because an open shop tends to limit the proportion of a firm's employees represented, this can significantly dilute a labor union's market control. Open shops are established in states that have right-to-work laws.

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MARGINAL PRODUCTIVITY THEORY

A theory used to analyze the profit-maximizing quantity of inputs (that is, the services of factor of productions) purchased by a firm in the production of output. Marginal-productivity theory indicates that the demand for a factor of production is based on the marginal product of the factor. In particular, a firm is generally willing to pay a higher price for an input that is more productive and contributes more to output. The demand for an input is thus best termed a derived demand.

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Today, you are likely to spend a great deal of time surfing the Internet looking to buy either a pleather CD case or a how-to book on fine dining. Be on the lookout for mail order catalogs with hidden messages.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
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