The word “entrepreneur” is a synonym for “salesperson.” Selling people to join your firm, selling them to stay at your firm, selling investors, and (oh yeah) selling customers. It doesn’t matter if you’re running the corner store or Pinterest—you’d better be damn good at selling if you plan to start a business. Selling is calling people who don’t want to hear from you, pretending to like them, getting treated poorly, and then calling them again.