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December 13, 2025 

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AMORTIZATION: The process of paying off a debt liability and accrued interest through a series of equal, periodic payments. Car loans and mortgages are two debts commonly paid off through amortization. Your monthly car payment, for example, partially pays for interest accrued on the outstanding balance and partly reduces that balance. Because one payment reduces the outstanding balance, each subsequent payment has a smaller portion for interest. If the proper amortization schedule has been calculated, your loan will be paid off with the last payment.

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PERFECT COMPETITION: An ideal market structure characterized by a large number of small firms, identical products sold by all firms, freedom of entry into and exit out of the industry, and perfect knowledge of prices and technology. This is one of four basic market structures. The other three are monopoly, oligopoly, and monopolistic competition. Perfect competition is an idealized market structure that's not observed in the real world. While unrealistic, it does provide an excellent benchmark that can be used to analyze real world market structures. In particular, perfect competition efficiently allocates resources.

     See also | market structure | firm | monopoly | oligopoly | monopolistic competition | perfect competition and demand | perfect competition and efficiency | perfect competition characteristics | perfect competition and short-run supply curve | monopoly and perfect competition |


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PERFECT COMPETITION, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: December 13, 2025].


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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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