Are Elon Musk’s Twitter Problems Tesla Problems, Too?

• Elon Musk says self-driving Tesla cabs — something he’s talked about for a long time — are just around the corner.
• But investors aren’t convinced: After his most recent demo, Tesla shares plummeted.
• Telsa investors are used to Musk making promises he struggles to keep. But maybe there’s something new happening.

On Thursday evening, Elon Musk — who never likes to do things small when he can go big — showed off his newest would-be products: not just a self-driving robotaxi but also a self-driving Robovan. And that wasn’t all: Musk also promised to eventually deliver “Star Wars”-style rob