Q: Why is Tesla worth more than GM? A: The sins of Detroit

Tesla Motors, Palo Alto, CaliforniaIt remains unclear whether Tesla will survive as an independent company, given that it's had exactly two profitable quarters in its 12-plus years of existence. And yet, last week, Tesla briefly passed General Motors to become the most valuable U.S. automaker by market capitalization. It had passed Ford last week, and long ago surpassed the value...