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MARGINAL REVENUE CURVE: A curve that graphically represents the relation between marginal revenue received by a firm for selling its output and the quantity of output sold. The marginal revenue curve is constructed to capture the relation between marginal revenue and the level of output, holding other variables constant.

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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.

     See also | Keynesian equilibrium | two-sector Keynesian model | three-sector Keynesian model | four-sector Keynesian model | Keynesian disequilibrium | recessionary gap, Keynesian model | inflationary gap, Keynesian model | injections-leakages model | multiplier | fiscal policy | Keynesian economics | Keynesian cross | aggregate expenditures | aggregate expenditures line | effective demand | induced expenditures | autonomous expenditures | macroeconomics | macroeconomic sectors | expansionary fiscal policy | contractionary fiscal policy | automatic stabilizers | injections | leakages | Keynesian cross and aggregate market | expenditures multiplier | accelerator principle | paradox of thrift | aggregate market analysis | business cycles |


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THIRD RULE OF INEQUALITY

The third of seven basic rules of the economy, stating that resources, income, and wealth are not equally distributed. Some people have more resources, income, and wealth and some people have less. Such inequality is due to natural abilities, acquired talents, market control, political power, and sheer luck.

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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either a coffee cup commemorating the 1960 Presidential election or a how-to book on fixing your computer, with illustrations. Be on the lookout for small children selling products door-to-door.
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