Research.LeutholdGroup

Pundits could reasonably argue the market has never been more expensive in light of the prevailing rate of inflation. That’s the conclusion of the “Rule of Twenty,” which proposes that the stock market’s P/E ratio and the trailing 12-month Consumer Price Inflation rate should sum up to 20.

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Inflation and its potential impact on the stock market is the topic du jour, resurrecting ideas that were in vogue 30- to 40-years ago.

Steve Leuthold’s 1980 book, The Myths of Inflation and Investing, provided an exhaustive review of the evidence. But for lighter reading, more appropriate for a summer Friday, we revisit the “Rule of Twenty” developed by strategist Jim Moltz in the early 1980s.

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