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CLOSED SHOP: An employment arrangement, usually written into a collective bargaining agreement, in which a firm is allowed to hire only labor union members. Because this gives a labor union complete control over the labor services supplied to a particular firm, it was one of the earliest methods used by labor unions to monopolized a labor market. However, closed shops were outlawed by the Taft-Hartley Act passed in 1947 and has been largely supplanted by union shops.

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U-SHAPED COST CURVES

The family of short-run cost curves consisting of average total cost, average variable cost, and marginal cost, all of which have U-shapes. Each is U-shaped because it begins with relatively high but falling cost for small quantities of output, reaches a minimum value, then has rising cost at large quantities of output. Although the average fixed cost curve is not U-shaped, it is occasionally included with the other three just for sake of completeness.

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Today, you are likely to spend a great deal of time looking for a downtown retail store trying to buy either a tall storage cabinet with five shelves and a secure lock or a birthday greeting card for your grandmother. Be on the lookout for cardboard boxes.
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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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