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November 11, 2025 

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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.

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LIBERAL: A political view that favors--(1) paternalistic government, (2) correction of market failure with government intervention, (3) equal opportunities for all citizens regardless of race, age, gender, ethnic origin, or planet of origin, (4) redistribution of income and wealth, and (5) extensive regulation and control by government over the profit-seeking businesses of the second estate.

     See also | paternalism | government | market failure | income distribution | wealth distribution | equity | regulation | first estate | second estate | third estate | command economy | free enterprise | Keynesian economics | conservative |


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KEYNESIAN MODEL

A macroeconomic model based on the principles of Keynesian economics that is used to identify the equilibrium level of, and analyze disruptions to, aggregate production and income. This model identifies equilibrium aggregate production and income as the intersection of the aggregate expenditures line and the 45-degree line. The Keynesian model comes in three basic variations designated by the number of macroeconomic sectors included--two-sector, three-sector, and four sector. The Keynesian model is also commonly presented in the form of injections and leakages in addition to the standard aggregate expenditures format. This model is used to analyze several important topics and issues, including multipliers, business cycles, fiscal policy, and monetary policy.

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