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July 18, 2025 

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ENTRY BARRIER: An institutional, government, technological, or economic restriction on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. 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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AVERAGE PRODUCT: The quantity of total output produced per unit of a variable input, holding all other inputs fixed. It is found by dividing total product by the quantity of the variable input. Average product, abbreviated AP also goes by the alias of average physical product (APP), so don't be confused by the extra term (physical). Compare this term with marginal product and average revenue product when you have a chance. If you haven't yet come across the term, then you really should spend some time with the law of diminishing marginal returns. The average-marginal rule is also worth a look.

     See also | total product | variable input | fixed input | average physical product | average revenue product | total revenue | marginal productivity theory | factor markets | marginal physical product | marginal physical product | marginal revenue product | law of diminishing marginal returns |


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AVERAGE PRODUCT, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 18, 2025].


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AVERAGE TOTAL COST CURVE

A curve that graphically represents the relation between average total cost incurred by a firm in the short-run product of a good or service and the quantity produced. The average total cost curve is constructed to capture the relation between average total cost and the level of output, holding other variables, like technology and resource prices, constant. The average total cost curve is one of three average curves. The other two are average variable cost curve and average fixed cost curve. A related curve is the marginal cost curve.

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