ECON 102 Lecture 12: Keynesian Framework

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Keynesian model - shows short run fluctuations. We want to explain the short run wobbles around the overall trends in output. Aggregate price level p is fixed, and producers are willing to increase quantity supplied at this fixed price. No government, g = t = tr = 0. Quantity of money m in the economy is fixed. Suppose i come upon an inheritance of million, which i get as long as i can spend it all. This is a change in autonomous spending - spending that is unrelated to the variables explained by our model. I buy a new house, new car, new wardrobe, etc. They same some and spend some (yd = c + s) The portion they spend becomes yet another person"s income. Third round of income, spending, and saving, and so on . Mpc = (change in consumption spending c)/(change in disposable income yd) Suppose that everyone in the economy has an mpc of 0. 75.

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