If a project's NPV is less than zero, then its IRR must be less than the WACC is correct in the project being considered has normal cash flows, with one outflow followed by a series of inflows.
The normal cash flow stream consists of an initial investment outlay followed by positive net cash flow throughout the project's life cycle.
It's also known as a traditional cash flow stream. In a traditional cash flow stream, cash flows only change direction once.
Thus, if project is NPV is less than zero IRR is less then WACC
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