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Estimate the Fair Share Price

For the investor, a too-high purchase price for the stock of an excellent company

can undo the effects of a subsequent decade of favorable business developments.

1

Warren Buffett 3.png

Warren Buffett

The fair share price is sometimes referred to as the fair share value and is considered to be the intrinsic financial value of the common shares of a company. The fair share price represents the maximum price you should pay for the shares, based on their expected financial return. Ideally, you should only buy the shares of a company when the market price is lower than the fair share price. The greater the discount from the fair share price, the greater the factor of safety against overpaying.


The fair share price of every company is necessarily subjective, because it depends on other investors' expectations with respect to the company's future financial success. While there are several different methods for estimating the fair share price for common shares, in my opinion, the most useful approach is based on the axiom that the fair price of any asset is equal to the price that buyers have been  willing to pay, whether it be for a house, a used car, or the common shares of a public company.


Many factors, will affect a company’s market price, including, for example, the company’s earnings, its financial prospects, management ability, investor sentiment, and overall economic conditions. Nevertheless, the price to earnings (P/E) ratio offers a convenient starting point for comparing the relative financial value of two different companies or for monitoring changes in the financial value of one company over time. 


My experience has been that a review of the historic values of the P/E ratio can provide a useful method for estimating the fair share price of financially stable companies.  


Value Line provides historic data for both the prices and the annual earnings for those companies included in their coverage universe. For example, the highest and lowest prices and annual earnings are highlighted on Figure 11, which was copied from the Value Line report for Sun Life Financial services, dated May 3, 2024: 

Excerpt from VLIS Report for SLF.png

The highlighted data on figure above has been copied in the table below. The highest and lowest price to earnings (P/E) ratios were then calculated for each year using the respective values, and the results are presented in the last two lines of the table. 

Hi and Low Prices SLF.png

As shown, the highest P/E ratios in recent years (2019 to the end of 2023) ranged from 10.7 (in 2021) to 16.2 (in 2020). Based on these values, it is reasonable to expect that the highest probable P/E ratio that can be expected to the end of 2024 will be about 15. Since the Value Line analyst estimates that SLF's earnings to the end of 2024 will be $6.85, it can be expected that the maximum market price for the shares to the end of 2024 will be about $103 (15 x $6.84).


Similarly, the lowest P/E ratios in recent years (2019 to the end of 2023) ranged from 8.3 (in 2021) to 11.4 (in 2023). Based on these values, it is reasonable to expect that the lowest probable P/E ratio that can be expected to the end of 2024 will be about 10. If the earnings to the end of 2024 are $6.85, then the lowest probable market price for the shares to the end of 2024 would be about $69 (10 x $6.84). The estimated average or fair share price for the shares in 2024 can be calculated to be $86 [($69 + $103)/2].


In summary, by the end of 2024, the market price for a common share of SLF can be expected to fall somewhere between $69 and $103, with an estimated average or fair share price of $86. Of course, unforeseen events could occur that could have a positive or negative effect on SLF's business, so that the market price may fall outside the expected range before the end of 2024. Nevertheless, based on the foregoing analysis, I would consider buying the shares anytime the price falls significantly lower than the fair share price of $86.


You should note that there is considerable room for judgement in the choice of the values used in these calculations. For this reason, you should always check your estimate of the fair share price with those of other trustworthy sources. There are good reasons why it is called the art, not the science, of investing.

1. Attributed to Warren Buffett. Source unknown.

Revision 3

October 2025

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