Tesla and SolarCity? Yes, it makes sense. Or at least it will.

Elon Musk announced last week that he wants Tesla, his electric-car company, to acquire SolarCity, the rooftop-solar company he helped found and now serves as chairman. Even assuming the merged company could get past its short-term challenges, its long-term fate rests on policy and regulatory decisions it can’t predict or determine. It’s a merger based on hope.

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