(eks-ten'sÅr, -sÅr), [TA] 1  A muscle the contraction of which causes movement at a joint with the consequence that the limb or body assumes a more straight line, or so that the distance between the parts proximal and distal to the joint is increased or extended; the antagonist of a flexor. See: muscle.
All other things being equal, using internal rate of return (IRR) and net present value (NPV) measurements to evaluate projects often results in the same findings. However, there are a number of projects for which using IRR is not as effective as using NPV to discount cash flows.
For instance, it doesnât tell us the length of the investment or how risky it is. Always consider the IRR in concert with: 1  the going in (calculated) and going out (assumed) cap rates.  the NPV (which requires selection of an internal discount rate) as of the end of the investment timeline.