The luxury electric-car company Tesla has yet to turn a profit, losing hundreds of millions of dollars last year alone. But on Monday, the darling of Silicon Valley became the most valuable American car company, surpassing General Motors, the Detroit granddaddy with $10 billion in sales on nearly 10 million vehicles. Shares of Tesla, run by high-profile chief executive Elon Musk, put the company’s value at $51.5 billion, above GM’s $50.2 billion. Tesla blew by Ford ($44.6 billion) last week.
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