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TOTAL FACTOR COST, PERFECT COMPETITION: The opportunity cost incurred by a perfectly competitive firm when using a given factor of production to produce a good or service. This is the total cost associated with the use of a particular resource or factor of production--it is the total cost of the factor. For a perfectly competitive firm, the price paid is constant and total factor cost increases at a constant rate. Total factor cost is predominately used in the analysis of the factor market. Two derivative factor cost measures are average factor cost and marginal factor cost.

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BARRIERS TO ENTRY

Institutional, government, technological, or economic restrictions on the entry of participants into a market or industry. The four primary barriers to entry are: (1) resource ownership, (2) patents and copyrights, (3) government restrictions, and (2) start-up cost. Barriers to entry are a key reason for market control and the inefficiency that results. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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