Zero to One: Notes on Startups, or How to Build the Future

by Peter Thiel

By the fall of ’99, our email payment product worked well—anyone could log in to our website and easily transfer money. But we didn’t have enough customers, growth was slow, and expenses mounted. For PayPal to work, we needed to attract a critical mass of at least a million users. Advertising was too ineffective to justify the cost. Prospective deals with big banks kept falling through. So we decided to pay people to sign up. We gave new customers $10 for joining, and we gave them $10 more every time they referred a friend. This got us hundreds of thousands of new customers and an exponential growth rate. Of course, this customer acquisition strategy was unsustainable on its own—when you pay people to be your customers, exponential growth means an exponentially growing cost structure. Crazy costs were typical at that time in the Valley. But we thought our huge costs were sane: given a large user base, PayPal had a clear path to profitability by taking a small fee on customers’ transactions. We knew we’d need more funding to reach that goal. We also knew that the boom was going to end. Since we didn’t expect investors’ faith in our mission to survive the coming crash, we moved fast to raise funds while we could. On February 16, 2000, the Wall Street Journal ran a story lauding our viral growth and suggesting that PayPal was worth $500 million. When we raised $100 million the next month, our lead investor took the Journal’s back-of-the-envelope valuation as authoritative. (O...