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The Graham Number

Ever heard of theĀ Graham Number? This was a formula developed by Ben Graham, the father of securities analysis, to determine the fair value for a stock.
The Graham Number is:

The square root of [earnings-per-share * book-value-per-share * 22.5]

(Take note that earning-per-share divided by book-value-per-share is our good friendĀ return on equity.)