Elon Musk says self-driving Tesla cabs — something he's talked about for a long time — are just around the corner. The next day, Wall Street declared itself thoroughly unimpressed: Investors knocked down Tesla shares by nearly 9%. Related storiesAnd at the same time, Tesla investors no longer seem so forgiving. Since Musk acquired Twitter — after failing at his attempt to back out of a signed deal to acquire Twitter — Tesla shares are down 4.7%. Something like "Tesla investors don't care about Musk's Twitter travails — at all."

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