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KEYNESIAN CROSS: The standard diagram used in Keynesian economics to identify the equilibrium level of aggregate output (that is, gross domestic product), with aggregate expenditures measured on the vertical axis, and aggregate output measured on the horizontal axis. This diagram contains two key lines, the aggregate expenditure line and the 45-degree line. Intersection between these lines indicates equilibrium aggregate output. This intersection, or cross, is what gives rise to the name.

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MARGINAL REVENUE PRODUCT: The change in total revenue resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal revenue product, usually abbreviated MRP, is found by dividing the change in total revenue by the change in the variable input. This is also termed value of the marginal product. Marginal revenue product is a key component for understanding the demand for productive inputs (that is, factor demand).

     See also | marginal revenue product curve | total revenue | marginal product | marginal physical product | variable input | factor demand | marginal revenue | profit maximization | marginal factor cost curve | factor markets | factors of production |


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MARGINAL REVENUE PRODUCT, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: December 6, 2025].


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PLASTIC MONEY

A slang phrase for credit cards, especially when such cards used to make purchases. The "plastic" portion of this term refers to the plastic construction of credit cards, as opposed to paper and metal of currency. The "money" portion is an erroneous reference to credit cards as a form of money, which they are not. Although credit cards do facilitate transactions, because they are a liability rather than an asset, they are not money and not part of the economy's money supply.

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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
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