Universal lessons are just that—they apply to everyone, or almost everyone. Sometimes, though, even the most knowledgeable people stray from what they know to be the better decision.
For example, asset allocation is critical, and rebalancing should be done periodically—particularly if your portfolio is more than 5% out of balance. At Vanguard, we promote these practices quite regularly. They’re good practices that disciplined investors should—and do—incorporate into their investing decisions.
What’s surprising (though maybe it shouldn’t be) is that, as a January Wall Street Journal article by Jason Zweig explains (subscription required), even some of the most well-known mavens of the investment world digress from their own investment philosophies.