Investors can approximate the average market return by buying an index fund. But if you buy individual stocks, you can do both better or worse than that. That downside risk was realized by Guardant Health, Inc. (NASDAQ:GH) shareholders over the last year, as the share price declined 13%. That falls noticeably short of the market return of around 19%. We wouldn’t rush to judgement on Guardant Health because we don’t have a long term history to look at. Furthermore, it’s down 11% in about a quarte…

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