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July 18, 2025 

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LEAKAGE LINE: A line used in the injection-leakage model representing the relation between non-consumption uses of income (that is, leakages) and national income. The three leakages are saving, taxes, and imports. The foundation of the leakages line is the saving line, which is then enhanced by adding taxes and imports. The other part of the injection-leakage model is a line representing injections. The intersection of the injection and leakage lines identifies equilibrium aggregate output, or Keynesian equilibrium.

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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.

     See also | institution | government | technology | firm | market | market control | inefficiency | monopoly | monopsony | oligopsony | perfect competition | monopolistic competition | monopsonistic competition |


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PRODUCTION FUNCTION

A mathematical relation between the production of a good or service and the inputs used. A production function captures the general relation between total production and one or more inputs. The standard production function includes labor and capital as the inputs. However, a production function is general enough that any number of inputs can be included

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