Long -run marginal propensity

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Reference no: EM136915

Q. Assume that we have a expenditure function of the form C = 220 + 0.9×Yp, where Yp is permanent disposable income. Suppose that consumers estimate their permanent disposable income by a simple average of disposable income in the present and previous years:
Yp== 0.5×(Yd + Yd-1), where Yd is actual disposable income.
a. Suppose that disposable income Yd is equal to $4,000 in year 1 and is also equal to $4,000 in year 2. Illustrate the consumption in year 2?
b. Suppose that disposable income increases to $5,000 in year 3 and then remains at $5,000 in all future years. What is consumption in years 3 and 4 and all remaining years?
Illustrate why expenditure responds way it does to an increase in income.
c. Illustrate the short-run marginal propensity to consume? What is the long -run marginal propensity to consume?
d. Explain why this formulation of consumption may provide a more accurate description of consumption than the simple consumption function that depends only on current income.

Reference no: EM136915

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