By many measures, 2020 was an unusual year in publishing, and that extended to Publishers WeeklyInternational news website of book publishing and bookselling including business news, reviews, bestseller lists, commentaries http://www.publishersweekly.com/'s bestsellers lists. In a rare occurrence, the Big Five publishers' hold over the adult hardcover and paperback bestsellers lists declined in 2020 compared to 2019, with independent publishers gaining ground.