Formula

Investment Decision Rule for Risky Projects

When evaluating projects with uncertain outcomes, the investment decision hinges on the Net Present Value (NPV) being positive. This rule requires using the project's expected return, XEX^E, and a risk-adjusted discount rate. The NPV is calculated by subtracting the initial investment, II, from the discounted expected return. The discount rate incorporates both the risk-free interest rate, rr, and a risk premium, RP\text{RP}, leading to the formula: NPV=XE1+r+RPI\text{NPV} = \frac{X^E}{1+r+\text{RP}} - I. A project should be undertaken if, and only if, this calculated NPV is greater than zero.

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Updated 2026-05-02

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