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April 13, 2026 

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INJECTIONS-LEAKAGES MODEL: A model used in Keynesian economics based on the equality of non-consumption expenditures (or injections) and non-consumption uses of income (leakages). On one side of the equality is saving, taxes, and imports -- the non-consumption leakages. On the other side of the equality is investment, government purchases, and exports -- the non-consumption injections. The injection-leakage model provides an alternative to the Keynesian cross for identifying equilibrium aggregate output.

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PRODUCT DIFFERENTIATION: Real of perceive differences among similar goods that prompt buyers to pay different prices. Product differentiation is a method used by some firms to achieve market control. The three methods of product differentiation are physical differences, perceived differences, and support services. The greater the differentiation is among products, then the more ability firms have to exert control over prices. Product differentiation is perhaps most important for market control by firms in monopolistic competition, but it also plays a role in oligopoly.

     See also | market control | monopolistic competition | oligopoly | market structure |


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OPPORTUNITY COST

The highest valued alternative foregone in the pursuit of an activity. Opportunity cost is a one of the most fundamental concepts used in the study of economics. An opportunity cost can be either explicit, usually involving a monetary payment, or implicit, which does not involve a transaction. Opportunity cost is also commonly termed economic cost.

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