Home Value Investing The Graham & Dodd P/E Matrix

# The Graham & Dodd P/E Matrix

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#### The Graham & Dodd P/E Matrix by Redfield, Blonsky & Co.

Based on his observations of stock over the years, Benjamin Graham developed a stock valuation model that allows for future growth. Graham observed that the average no-growth stock sold at 8.5 times earnings, and that price-earnings ratios increased by twice the rate of earnings growth. This led to the earnings multiplier:

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P/E = 8.5 + 2G

where G is the rate of earnings growth, stated as a percentage.

The original formulation was made at a time when there was very little inflation, and growth could be assumed to be real growth; the AAA corporate bond interest rate prevailing at the time was 4.4%. In later years, the formula was adjusted for higher current interest rates that contained an inflationary component:

P/E = [8.5 + 2G] × 4.4/Y

where Y is the current yield on AAA corporate bonds.

As an example, at a 6% bond yield and an assumed annual earnings growth rate of 10%, the P/E multiplier would be:

P/E = [8.5 + 2(10)] × 4.4/6
= 28.5 × 0.73
= 20.9

The Graham and Dodd P/E Matrix uses this valuation formula to show the price-earnings ratio that results from a given bond yield at a given rate of earnings growth. You can see from the table that changes in interest rates will have a dramatic effect on price-earnings ratios for any given earnings growth rate.

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