I recently posted Entry #458 to my weekly Valuation-Informed Indexing column at the Value Walk site. It’s called Permitting Honest Posting on How Stock Investing Works Changes How Stock Investing Works.
Juicy Excerpt: Is there a giant conspiracy? Yes and no. I don’t believe that a bunch of people met in a room and decided to mislead. What I like to say is that there is a conspiracy of ignorance. Up until 1980, we only knew a limited number of things about how stock investing works and, given what knowing that limited number of things told us, Buy-and-Hold looked like a very plausible strategy. Robert Shiller changed that when he published his Nobel-prize-winning research showing that valuations affect long-term returns. If Shiller’s research is legitimate, stock investing risk is not stable but variable and investors who want to maintain a constant risk profile over time have no choice but to adjust their stock allocations in response to big valuation shifts. But most of us have not incorporated Shiller’s findings into our understanding of how stock investing works because the old understanding permits us to continue to believe that the numbers on our portfolio statement accurately reflect the true, lasting value of our portfolio and we like being able to continue to believe that.


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