Anita Elberse, Harvard Business School’s expert on the entertainment industry, explains why building a business around blockbuster products—the movies, television shows, songs, and books—is the surest path to long-term success. In her book Blockbusters, she looks at what’s behind the phenomenal success of entertainment businesses such as Warner Bros., Marvel Entertainment, and the NFL—along with such stars as Jay-Z, Lady Gaga, and LeBron James.