How is a project's IRR just a bond's yield to maturity, and which four conditions make it agree with NPV?
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IRR:
Write the defining equation, match it term by term to a bond's yield to maturity, and state the accept rule (IRR above the hurdle) and the rule for mutually exclusive projects.
Four conditions under which IRR agrees with NPV
List one cash outflow, at ; one project under consideration; the same opportunity cost of capital for all periods; and a hurdle rate equal to that opportunity cost of capital.
Loan-type cash flows reverse the rule
Build an investment and its mirror-image loan with equal IRRs, sketch NPV against the discount rate for each, and record that the loan is accepted when IRR is below the cost of capital.
No IRR: a quadratic with only complex roots
Multiply through to get a polynomial of degree in , apply the quadratic formula to a two-period project with a negative discriminant, and record that no real IRR exists.