 Gladwell and his co-author, John Decker, both received an estimated US$1–1.5 million advance for "The Tipping Point", which sold 1.7 million copies by 2006.In the wake of the book's success, Gladwell was able to earn as much as $40,000 per lecture.Sales increased again in 2006 after the release of Gladwell's next book, "Blink".