Jim O’Shaughnessy is one of the good guys. In 1996 he authored one of the all-time great investment references, What Works on Wall Street, where he analyzed an enormous variety of equity related financial metrics to determine which factors work to predict strong future individual stock performance. After analyzing dozens of equity metrics, from common ones like P/E, ROE, P/B and Earnings Growth to more esoteric ones like NAV/EBITDA.
Jim revisited some of the lessons in his original book during a recent presentation at the Fortigent Winter Forum in Savannah, Georgia.
- To make inferences, investors should look at performance across longer time-frames. He recommends 20-years.
- History doesn’t repeat, but it rhymes: “It rhymes because human beings are the agent of changing prices on the stock market.”
- The market is mean-reverting; stocks will both over-perform and under-perform their relevant benchmarks, but return to a long-term mean.
- Composite indicators of several valuation metrics work better than any single one because the efficacy of single metrics go in and out of favour over time.
- Value composites work in the long-term, but momentum works best in the short term.
- Momentum works best when adjusted for volatility (you don’t say ;).
- Over the 20-year period from the March 2000 peak, U.S. large-cap stocks will mimic their performance after the 1929 peak, and deliver approximately 0.3% per year.