Buyers can be confident because Chevy has 3,000 US dealers to service the new electric vehicle, she said. The implication was that Tesla, with just 69 service centers nationwide, can make no such promise.
The uncharacteristic insult from Barra was designed to highlight the difference between 108-year-old GM and Tesla, a disruptive teenager. It also acknowledged a budding rivalry that could help determine whether Detroit or Silicon Valley sets the course for the future of the auto industry.
Yet, as both CEOs face shareholders for annual meetings Tuesday, it is Barra who must explain to skeptical investors why GM's future is as bright as Tesla's.
GM's stock is trading around the USD 33 price of its initial public offering seven years ago. During that time, Tesla shares have soared more than tenfold to USD 335. Wall Street now values Tesla at about USD 55 billion, compared to around USD 50 billion for GM.
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GM's net profit margin in 2016 was 5.7 per cent. By comparison, Alphabet Inc, parent of Google, had a 22 per cent margin.
Although it's an automaker, Tesla started in the tech bucket and remains there in the eyes of investors and buyers, Ramsey says.
Still, the big changes in the auto industry are in the early stages. Electric vehicles make up less than 1 percent of global auto sales and fully self-driving cars are years away. The economy can falter and company fortunes can shift. Already this year, sales in the US and China are slowing, and GM pulled out of the European and Indian markets because they weren't profitable.
"Tesla is absurdly overvalued if based on the past, but that's irrelevant. A stock price represents risk-adjusted future cash flows," Musk tweeted in April.
Still, Musk can't risk any missteps as Tesla pivots from a niche manufacturer of 84,000 high-priced cars per year. The Model 3 sedan, Tesla's first mainstream car, is due out later this year, but previous launches have been plagued with delays.
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