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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One potential problem with any far and wide ambling tour of the economy is ambling too far or too wide. Such is the case as we find ourselves in the quaint and courteous Republic of Northwest Queoldiola. While we're here, let's take the opportunity to explore the quaint and courteous economy of the Northwest Queoldiola. Our impromptu economic expedition is faced with an immediate roadblock. I have a pocket filled with good old U. S. dollar bills, but the quaint and courteous people of Northwest Queoldiola don't trade their wares for good old U. S. dollar bills. They prefer the quaint and courteous Northwest Queoldiolan currency, the queold. All we need to do is trade my good old U. S. dollar bills for quaint and courteous queolds.
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Today, you are likely to spend a great deal of time touring the new suburban shopping complex trying to buy either an instructional DVD on learning to the play the oboe or a small, foam rubber football. Be on the lookout for gnomes hiding in cypress trees.
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This isn't me! What am I?

-- Peter F. Drucker

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