Four crash warnings in one weekend, a 4.4% drop and the worst week since April. Jack Bogle's rule for moments like this was six words long, and his second rule, your age in bonds with Social Security counted, tells a…

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Jack Bogle’s rule for a week like the one that just ended was six words long: "Don’t do something, just stand there." The founder of Vanguard, who launched the first index fund for ordinary investors in 1976 and died in 2019 at 89, said it on CNBC in January 2016 during a global sell-off, had written it in his 2007 book, and repeated the 6-word rule for the rest of his life.

It is worth hearing again this weekend.…