Why 'sell in May and stay away' might be terrible investment advice

Like many pieces of age-old wisdom, this little adage doesn't always hold up to scrutiny

Since 1950, the Dow has, on average, been up 7 percent from November to April, and flat from May to October.
(Image credit: Spencer Platt/Getty Images)

Should you "sell in May and go away," as the old investment advice goes? Or just keep cool and go about your summer?

It's literally a centuries-old question. (It dates back to 1694, to be exact.) The original rhyme, "Sell in May and go away, don't come back till St. Leger Day," refers to the British horse-racing season, when folks relaxed at the track during the summer months while their lightened portfolios simmered on the back burner. The result was fewer people trading — a "thin market" — which meant more volatility, says Britain's Telegraph.

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Carmel Lobello is the business editor at TheWeek.com. Previously, she was an editor at DeathandTaxesMag.com.