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Profitability index (PI), also known as profit investment ratio (PIR) and value investment ratio (VIR), is the ratio of payoff to investment of a proposed project. It is a useful tool for ranking projects because it allows you to quantify the amount of value created per unit of investment.
The ratio is calculated as follows:
Assuming that the cash flow calculated does not include the investment made in the project, a profitability index of 1 indicates breakeven. Any value lower than one would indicate that the project's present value (PV) is less than the initial investment. As the value of the profitability index increases, so does the financial attractiveness of the proposed project.
The PI is similar to the Return on Investment (ROI), except that the net profit is discounted.
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✪ Profitability Index

✪ profitability index/profitability index formula

✪ Net Present Value (NPV) vs Profitability Index (PI)
Transcription
Contents
Example
We assume an investment opportunity with the following characteristics:
 Investment = $40,000
 Life of the Machine = 5 Years
CFAT Year CFAT 1 1000 2 11000 3 100 4 9000 5 6000
Calculate Net present value at 6% and PI:
Year CFAT PV@10% PV 1 18000 0.909 16362 2 12000 0.827 9924 3 10000 0.752 7520 4 9000 0.683 6147 5 6000 0.621 3726 Total present value 43679 () Investment 40000 NPV 3679 PI = 43679/40000 = 1.091 > 1 ⇒ Accept the project
See also
References
External links
Use explained in the business book: Pursuing the Competitive Edge, Hayes, Pisano, Upton and Wheelwright. Wiley, 2005. pg. 264