project leverage (debt structure) changes over time, which will
change overall project risk. Hence the use of Single
Discount Rate for Large-Scale Project is inappropriate. Multiple
discount rate (MDR) takes into consideration the change in the
leverage of the project. The adjustment can be made if one can
fairly estimate leverage risk which generally decreases as business
goes overtime. Mandron [2000] advocated the use of MDR in
large-scale project valuation which considers the changes in the
capital structure of a project as well as the distribution of
overall project risk in time. So, MDR is recommended over single
discount rate.
For more detail kindly see
Mandron, A. “Improved Techniques for Valuing Large-Scale Projects: A Follow-Up.” The Journal of Structured Finance, Vol. 6, No. 1 (2000), pp. 33-45.
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