Watch it on Academic Earth
Click on this link to open iTunes and add this course to your podcasts
Copy this link into your RSS reader to subscribe to this course via RSS
Right-click (or Ctrl-click on Mac) and select "Save as..."
Musk talks about the difference in the customer base of PayPal and SpaceX: PayPal is a consumer product and SpaceX sells rockets, which have very few customers. SpaceX involves individual selling process and no viral marketing.