On the Utility of P/E Ratios Going Back 70+ Years

Geoff Gannon submits: After my last post, Bill Rempel (among others) inquired about the difference in normalized P/E ratios over different decades. He felt a standard applied across 70+ years might not be particularly useful today, because so much has changed (increased participation in equity markets, different monetary policies, etc.) As a result, it might be that while "relatively cheap" is better than "relatively expensive" within each time period, it is inappropriate to compare years from dissimilar decades as if the same standards applied. I agree. So, over the next two posts, I'll try to give you an idea of what the compound point growth in the Dow looked like following the low normalized P/E years and high normalized P/E years within each decade. In other words, I'll look at low normalized P/E years and high normalized P/E years relative to other years in the same decade.

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