Tesla sends S&P 500 crowd on a wild ride of surges and crashes

Esha Dey and Elena Popina

There was a sense among Wall Street types a year ago that Tesla's entrance into the S&P 500 Index would calm the stock. Sure, it would still have sporadic moments of Elon Musk-driven swings -- up 5% Tuesday, down 5% Wednesday -- but overall, it would behave more like a proper, staid member of the blue-blooded community it was joining.

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