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Q3. Consumption and the real interest rate: According to the life-cycle/permanentincome hypothesis, consumption depends on the present discounted value of income. An increase in the

Q3. Consumption and the real interest rate: According to the life-cycle/permanentincome hypothesis, consumption depends on the present discounted value of income. An increase in the real interest rate will make future income worth less, thereby reducing the present discounted value and reducing consumption. To incorporate this channel into the IS model, suppose the consumption equation is given by Ct = acYt -bc (Rt - r)Yt Assume the remainder of the model is unchanged from the original setup, as in Table 11.1 of the Jones textbook. (a) Derive the IS curve for this new specification. (b) How and why does it differ from the original IS curve? (Hint: Think about the slope of the IS curve.)

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