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

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16 Jan 2018
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EC140 Full Course Notes
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Autonomous expenditure: does not change when income changes (can change for other reasons) Induced expenditure: can change when income changes (can change for other reasons) In a model with no gov. /taxes, yd = y. A = autonomous consumption the amount you would spend even if your income is 0 (eg. if it was 0, you"d be spending your savings) B = (mpc) if i have a dollar and b = 0. 8, i"ll spend 80 cents and save 20 cents. If i had 0 income, apc would be infinite: apc decreases as income goes up, as they get richer, they spend a smaller fraction of their income. If consumption is above the 45 degree line, savings are negative. If consumption is below the 45 degree line, savings are positive. Every dollar of income must to go into consumption or savings: households don"t invest , only firms invest (households save) Saving = income consumption: s = -a + (1 b) * yd.

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