You can be forgiven for not knowing what to make of Tesla's amazing run and the battling views on whether it can keep racing. Fans are cheering Elon Musk's speedster from the home side of the bleachers, and naysayers are blasting boos from across the track. Boosters such as Ron Baron, chief of major shareholder Baron Capital, recently forecast that Tesla will mushroom to "at least $1 trillion in sales" over the next 10 years, while a legion of noted short-sellers, including Jim Chanos of Kynikos Associates, were betting big against the electric-car maker when it was far cheaper, and fared poorly

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