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.

     See also | labor union | union shop | open shop | right to work | collective bargaining | supply to a firm | Taft-Hartley Act | factor market | monopoly | market control | yellow-dog contract |

CLOSED SHOP, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: October 10, 2026].

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A perfectly competitive firm produces the profit-maximizing quantity of output that equates marginal revenue and marginal cost. This production level can be identified using total revenue and cost, marginal revenue and cost, or profit. Because a perfectly competitive firm faces a perfectly elastic demand curve, it efficiently allocates resources by equating price and marginal cost. In addition, the marginal cost curve above the average variable cost curve is the perfectly competitive firm's short-run supply curve.

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