Roughly a decade ago, Tesla CEO Elon Musk outlined a master plan for the electric car company: build a sports car that could outpace high-performance gasoline-powered vehicles, use the proceeds to develop an affordable car and repeat for even better results. 10 years on, the company has followed through with that agenda: after launching the pricey Tesla Roadster, it released the Model S sedan and the Model X SUV, and unveiled its relatively reasonable Model 3 in April with a sticker price of $35,000. Now, Musk has unveiled the second phase of the ambitious automaker’s secret plan, and it sounds pretty…

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