#211 with Julian Shapiro - The 3 Cheat Codes Startups Use to Print Cash

Livingston: Was the growth viral? Levchin: We built the system to be viral from day one. The idea was: I can send you the money, even if you aren't a member. If I send you $10, you get an email saying, "You have $10 waiting for you. Sign up, and you can take it." That's the most powerful viral driver there is. Free money available to you.