What is Silicon Valley’s greatest reigning monopoly? How did PayPal manage to emerge from the dotcom implosion? Can you build a great tech company and keep it private forever? And how did Elon Musk manage to wreck an uninsured, million-dollar car with Peter Thiel in the passenger seat speeding on the way to a VC meeting? Marc Andreessen and Thiel discuss all of it in a wide-ranging conversation that toggles off the topics in Thiel’s new book “Zero to One.”