Consider the following spot interest rates for maturities of one, two, three, and four years.
r1 = 3.9% r2 = 4.5% r3 = 5.2% r4 = 6.0%
Assuming a constant real interest rate of 2 percent, what are the approximate expected inflation rates for the next four years?
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[1+ Inflation rate] = [1+Nominal rate of return]/ [1+ Real rate of return]
Real rate of return = 2% = 0.02
Nominal rate = 3.9% = 0.039
[1+ Inflation rate] = [1+0.039]/[1+0.02]
[1+ Inflation rate] = [ 1.039]/[1.02]
[1+ Inflation rate] = 1.0186
Inflation rate = 1.0186-1 = 0.0186 = 1.86%
I1 = 1.86%
Similarly by replacing nominal rate to 4.5% we can find I2,5.2% we can find I3 and 6.0% we can find I4
Inflation rate for 2 years = [1+0.045]/1.02]-1
Inflation rate for 2 years = 2.45%
I2 = 2.45/2 years = 1.225% per year
Inflation rate for 3 years = [1+0.052]/1.02]-1
Inflation rate for 3 years = 3.14%
I3 = 3.14/3 = 1.045%
Inflation rate for 4 years = [1+0.06]/1.02]-1 = 3.92%
I4 = 3.92/4 = 0.98%
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