ECON 102 Lecture 10: Econ 102 Lecture 10 Notes

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9 Feb 2017
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ECON 102 Full Course Notes
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Investment (i) is a central element of economic growth. Investment is also the most volatile component of the aggregate expenditure identity, and is a major source of sr fluctuations. By simple definitions & national income accounting, aggregate savings (s) must equal aggregate investment (i) For now, assume a very simple economy: Ex = im = nx = 0 no international trade. Then it must be that total income (y) equals total spending (gdp) To make money in this economy, you must sell something. National income: y = c + s. Households do one of two things with their income: spend it or save it. An identity; if money is not spent on consumption, it must have been saved (i. e. , not spent) Aggregate expenditure: gdp = c + i. But we assumed g = 0 and nx = 0. Y = gdp c + s = c + i.

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