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| The '''Modified Internal Rate of Return''' (MIRR) is a [[finance|financial]] measure of an [[investment]]'s attractiveness.<ref>Lin, S. A. Y., "The modified internal rate of return and investment criterion," ''The Engineering Economist'' 21(4), 1976, 237-247.</ref><ref>Beaves, R. G., "Net present value and the rate of return: Implicit and explicit reinvestment assumptions," ''The Engineering Economist'' 33, 1988, 275-302.</ref> It is used in [[capital budgeting]] to rank alternative investments of equal size. As the name implies, MIRR is a modification of the [[internal rate of return]] (IRR) and as such aims to resolve some problems with the IRR.
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| ==Problems with the IRR==
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| While there are several [[Internal rate of return#Problems with using internal rate of return|problems with the IRR]], MIRR resolves two of them.
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| Firstly, IRR assumes that interim positive cash flows are reinvested at the same rate of return as that of the project that generated them.<ref>[http://www.cfo.com/article.cfm/3304945 Internal Rate of Return: A Cautionary Tale]</ref> This is usually an unrealistic scenario and a more likely situation is that the funds will be reinvested at a rate closer to the firm's cost of capital. The IRR therefore often gives an unduly optimistic picture of the projects under study. Generally for comparing projects more fairly, the [[weighted average cost of capital]] should be used for reinvesting the interim cash flows.
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| Secondly, more than one IRR can be found for projects with alternating positive and negative cash flows, which leads to confusion and ambiguity. MIRR finds only one value.
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| ==Calculation of the MIRR==
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| MIRR is calculated as follows:
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| <math>\mbox{MIRR}=\sqrt[n]{\frac{FV(\text{positive cash flows, reinvestment rate})}{-PV(\text{negative cash flows, finance rate})}}-1</math>,
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| where ''n'' is the number of equal periods at the end of which the cash flows occur (not the number of cash flows), ''PV'' is [[present value]] (at the beginning of the first period), ''FV'' is [[future value]] (at the end of the last period).
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| The formula adds up the negative cash flows after discounting them to time zero using the external cost of capital, adds up the positive cash flows including the proceeds of reinvestment at the external reinvestment rate to the final period, and then works out what rate of return would cause the magnitude of the discounted negative cash flows at time zero to be equivalent to the future value of the positive cash flows at the final time period.
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| [[Spreadsheet|Spreadsheet applications]], such as [[Microsoft Excel]], have inbuilt functions to calculate the MIRR. In Microsoft Excel this function is "=MIRR". | |
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| ===Example===
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| If an investment project is described by the sequence of cash flows:
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| {| class="wikitable" align="left"
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| |-
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| ! Year
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| ! Cash flow
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| |- align="center"
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| | 0
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| | -1000
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| |- align="center"
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| | 1
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| | -4000
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| |- align="center"
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| | 2
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| | 5000
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| |- align="center"
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| | 3
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| | 2000
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| |}
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| {{-}}
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| then the IRR <math>r</math> is given by
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| <math>\mbox{NPV} = -1000 + \frac{-4000}{(1+r)^1} + \frac{5000}{(1+r)^2} + \frac{2000}{(1+r)^3} = 0</math>.
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| In this case, the answer is 25.48% (the other solutions to this equation are -593.16% and -132.32%, but they will not be considered meaningful IRRs).
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| To calculate the MIRR, we will assume a finance rate of 10% and a reinvestment rate of 12%. First, we calculate the present value of the negative cash flows (discounted at the finance rate):
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| <math>PV(\text{negative cash flows, finance rate}) = -1000 + \frac{-4000}{(1+10%)^1} = -4636.36</math>. | |
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| Second, we calculate the future value of the positive cash flows (reinvested at the reinvestment rate):
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| <math>FV(\text{positive cash flows, reinvestment rate}) = 5000\cdot(1+12%)^1 + 2000 = 7600</math>.
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| Third, we find the MIRR:
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| <math>\mbox{MIRR}=\sqrt[3]{\frac{7600}{4636.36}}-1=17.91%</math>.
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| The calculated MIRR (17.91%) is significantly different from the IRR (25.48%).
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| ==Comparing projects of different sizes==
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| Like the internal rate of return, the modified internal rate of return cannot be validly used to rank-order projects of different sizes, because a larger project with a smaller modified internal rate of return may have a higher present value. However, there exist variants of the modified internal rate of return which can be used for such comparisons.<ref>Shull, D. M., "Efficient capital project selection through a yield-based capital budgeting technique," ''The Engineering Economist'' 38(1), 1992, 1-18.</ref><ref>Hajdasinski, M., "Remarks in the context of 'The case for the generalized net present value formula'," ''The Engineering Economist'' 40(2), 1995, 201-210.</ref>
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| ==References==
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| <references/>
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| [[Category:Mathematical finance]]
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| [[Category:Investment]]
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