What's a 'gray rhino' and why did it cause Chinese stocks to drop? – CNNMoney

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Is this the new normal for Wall Street?

Is this the new normal for Wall Street?

Many investors lose sleep over “black swans” — hard-to-predict events that cause chaos, like terror attacks or the bursting of the dot-com bubble.

Now authorities in China are being urged to watch for “gray rhinos” — obvious dangers that are often ignored anyway.