(a) Conceptually define how r, and it differ from one another. Given this, provide some intuition for why the Fisher relationship as written above must hold.

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Chapter1: Making Economics Decisions
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1. The Fisher relationship relates the real interest rate, rt, to the nominal interest rate, it, as well as the
current and future price of goods measured in terms of money, Pt and Pt+1. It is given by:
Pt
Pt+1
1 + rt = (1 + it);
(a) Conceptually define how r, and it differ from one another. Given this, provide some intuition for
why the Fisher relationship as written above must hold.
(b) Define the (gross) expected inflation rate as 1+ +1
relationship approximately implies:
Ttit - +1
1+rt =
=
Pt+1. Use this to show that the Fisher
Pt
(c) Suppose that, in the medium to long run, the real interest rate satisfies:
1 Yt+1
B Yt
1
Define B =
where p > 0. Take logs to derive an approximate relationship between the real interest
1+p
rate, p, and the expected growth rate of output. Argue that the real interest rate is increasing in p and
increasing in the expected growth rate of output. Provide some intuition (based on competitive equilibrium
in an endowment economy) for your answers.
(d) If, as immediately above, the real interest rate in the medium to long run is independent of the
inflation rate, and if expected inflation equals actual inflation in the medium to long run, what is the primary
determinant of the level of the nominal interest rate in the medium to long run? Is your answer consistent
with what we observe in the data?
Transcribed Image Text:1. The Fisher relationship relates the real interest rate, rt, to the nominal interest rate, it, as well as the current and future price of goods measured in terms of money, Pt and Pt+1. It is given by: Pt Pt+1 1 + rt = (1 + it); (a) Conceptually define how r, and it differ from one another. Given this, provide some intuition for why the Fisher relationship as written above must hold. (b) Define the (gross) expected inflation rate as 1+ +1 relationship approximately implies: Ttit - +1 1+rt = = Pt+1. Use this to show that the Fisher Pt (c) Suppose that, in the medium to long run, the real interest rate satisfies: 1 Yt+1 B Yt 1 Define B = where p > 0. Take logs to derive an approximate relationship between the real interest 1+p rate, p, and the expected growth rate of output. Argue that the real interest rate is increasing in p and increasing in the expected growth rate of output. Provide some intuition (based on competitive equilibrium in an endowment economy) for your answers. (d) If, as immediately above, the real interest rate in the medium to long run is independent of the inflation rate, and if expected inflation equals actual inflation in the medium to long run, what is the primary determinant of the level of the nominal interest rate in the medium to long run? Is your answer consistent with what we observe in the data?
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