EC140 Lecture Notes - Lecture 4: Autonomous Consumption, Macroeconomic Model, Consumption Function

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EC140 Full Course Notes
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Ec 140- lecture 4: simplest short- run macro model; chapter 21. Gdp measured in expenditure is made up of: Autonomous expenditure does not change when income changes. We start with a very simple model. Understand the basic mechanics of a macroeconomic model: closed economy- no trade, no government, and no taxes, constant prices. People buy consumption goods from disposable income, In a model w no government or taxes, Consumption is assumed to increase w disposable income. B is the marginal propensity to consumer (mpc) Equals b in our desired consumption equation. What households do not spend on consumption is savings. Increases in wealth shift the consumption function up. Changes in interest rates: a fall in interest rates (normally) shifts the consumption function up. Expectations about the future: optimism about the future shifts the consumption function up. Shifts vs. rotations: changes often assumed as shifts (no change in mpc) Inventory accumulation: firms may change how much inventory they want to hold.

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