Elon Musk is a key competitive advantage for both Tesla and SpaceX, investor Emmet Peppers says, citing his engineering role in each company’s growth. He has pr

Elon Musk is a key competitive advantage for both Tesla and SpaceX, investor Emmet Peppers says, citing his engineering role in each company’s growth. He has previously argued their fortunes — and potentially their trading patterns — could become increasingly aligned.