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In practical, the rate of return is different from the theoretical value, which depends upon the time of payment. The rate of return also depends on whether the bonds are short-termed or long-termed.


Let us take an example to understand this. Say, the rate of return of the 1st year is 20% and the rate of return of the 2nd year is 30%, then what will be the 2-year holding rate of return? This can be determined by using the two 1-year compounding formula as given below:

Working with Time-Varying Rates of Return 1

Putting r0, 1=20, r1, 2 =30, we get r0, 2 =56%.

The compounding formula is not applicable only for a period of two years. It can be used for determining the holding rate of return in the future. For example, let us assume that the 1-year rate of return is 30% from 1st year to 2nd year, 40% from 2nd year to 3rd year, and 50% from 3rd year to 4th year, then the holding rate of return for the next 3 years, starting from next year is giving by:

Working with Time-Varying Rates of Return 2

Putting the values, we get r1, 4 = 173%. Say, if your investment is $1, then at the end of three years, you will receive $1 and an extra of $1.73 dollar, making the total amount received equal to $2.73.

The rate of interest which begins from the present moment, denoted by a 0 subscript are called spot rates and the interest which begins in the future are called future rates.


  1. Find the total interest rate when the first year interest rate is 2% and it is 3% for the second year.
  2. A 2-year project has returned 22% in its 1st year but overall it has lost half of its value. Calculate the rate of return after the 1st
  3. The year and the annual rate of return of S&P 500 of year has been given in the table. Study the table given below and answer the question:

Working with Time-Varying Rates of Return 3

Find the rate of return over the first six years and the second six years. Also, calculate the rate of return over the entire period of 12 years.

  1. There are a loss of one-third of the value of a project in the 1st year, in the 2nd year it gained 50% of its value and in the third year, it lost two-thirds of its value, and finally in the 4th year, the value doubled. Calculate the rate of return over the entire period.


An easy way of measuring the interest accumulated by money over a period of time,is estimated by considering the average annual rate of return, which is defined as annualized rates.

Let us understand this by taking an example. If the holding rate of return is 173% over a period of three years, the annualized rate of return will not be given by 173%/3, i.e. 57.7%. This is because this value ignores the compound interest calculated on the interest earned after the first and second years. Instead, a single hypothetical rate of interest needs to be found out which is given by . This equation is given by

Working with Time-Varying Rates of Return 4

Where the holding rate of return, r0, t is for a period of 3 years and hence r0.3 is 173% as per the example taken. We need to find the annualized rate of return . This is given by the following generalized formula:

Working with Time-Varying Rates of Return 5

It should be noted here that compounding is analogous to adding and annualizing is analogous to averaging.


5.A value is earning interest at the rate of 5% over four months. Calculate the annualized rate of return.

6.If the two-year holding rate of return is 40%, then, the average rate of return is 20% per year. Calculate the annualized rate of return and compare it with the average rate.

  1. Give your answer with reasons whether the compound rate is lower or higher than the sum of the individual rates of return, and also whether the annualized rate is lower or higher than the average of individual rate of return.
  2. For five years, if the total holding rate of interest is 50%, then calculate the annualized rate of return.

9.For each of the next five years, if the rate of interest is 10% per year, find out the annualized 5-year rate of return.


The net present value of the time-varying interest rate is given by:

Working with Time-Varying Rates of Return 6

Where NPV is the net present value and PV is the present value of that particular year which is given in bracket.


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