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AGGREGATE EXPENDITURE LINE: A line representing the relation between aggregate expenditures and gross domestic product used in the Keynesian cross. The aggregate expenditure line is obtained by adding investment expenditures, government purchases, and net exports to the consumption line. As such, the slope of the aggregate expenditure line is largely based on the slope of the consumption line (which is the marginal propensity to consume), with adjustments coming from the marginal propensity to invest, the marginal propensity for government purchases, and the marginal propensity to import. The intersection of the aggregate expenditures line and the 45-degree line identifies the equilibrium level of output in the Keynesian cross.

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OPPORTUNITY COST: The highest valued alternative foregone in the pursuit of an activity. This is a hallmark of anything dealing with economics--and life for that matter--because any action that you take prevents you from doing something else. The ultimate source of opportunity cost is the pervasive problem of scarcity (unlimited wants and needs, but limited resources). Whenever limited resources are used to satisfy one want or need, there are an unlimited number of other wants and needs that remain unsatisfied. Herein lies the essence of opportunity cost. Doing one thing prevents doing another.

     See also | economics | scarcity | unlimited wants and needs | limited resources | resources | scarce resource | free resources | production possibilities | production possibilities frontier | law of increasing opportunity cost | value | satisfaction | consumption | production | economic cost | accounting cost | total cost |


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OPPORTUNITY COST, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: November 8, 2025].


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MODEL

An abstract representation of the real world that is usually based on scientific theories, principles, and hypotheses. A model is used to analyze economic phenomena by focusing on a small number of essential aspects of the real world. It is then manipulated to derive conclusions and implications that can be applied to the real world.

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