hard · Principles of Finance

Under capital rationing, why might a firm use the 'Profitability Index' (PI) instead of just ranking by the highest absolute NPV?

  1. Ranking by NPV is always mathematically identical to ranking by PI.
  2. PI identifies the 'bang for the buck', maximizing total NPV within a limited budget.
  3. PI ignores the discount rate, making it easier to use in volatile markets.
  4. PI is a more accurate measure of the project's IRR.

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