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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We need to pay another visit to Scarcity Stan's Ye Olde Bakery Shoppe and Confectionery Palace. But this is not a social visit, nor is intended for some delectable pastries that will add a few extra pounds to our waistlines. We're here on official economic business. Stan's at wits end. He doesn't know what to do. There's been so much demand for his economic pie, what with society's unlimited wants and needs, that he needs to make it bigger. Our job is to figure out how. While we're doing that, we'll also see how to put our economy on the path to economic growth.
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Today, you are likely to spend a great deal of time flipping through the yellow pages wanting to buy either handcrafted decorations to hang on your walls or throw pillows for your bed. Be on the lookout for slightly overweight pizza delivery guys.
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