Are Electric Vehicle Stocks in a Bubble?

Shares of Tesla (NASDAQ: TSLA) continue to defy gravity, but it's not the only electric-vehicle maker with outsize returns in 2020. In a world moving more quickly toward renewable energy sources, there's reason for excitement for a product that can successfully replace the internal combustion engine. 

But if you're an investor, you need to know whether these valuations are justified, or if you're going to be a victim of another stock market bubble. 

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Source Fool.com