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Superman ranks at the top of the list of best-selling comic book series of all time, having sold an estimated 600 million copies worldwide. Action Comics, the series which introduced the Superman character, remains very popular even today with its thousandth issue selling over half a million copies and earning the title of best-selling comic book in North America in 2018.

Influence of comic books

Comic books have been an important part of American pop culture for decades, and with numerous series accumulating total sales in the hundreds of millions of units, their popularity is unquestionable. In North America alone, annual sales revenues from comic books and graphic novels frequently exceed one billion dollars, and a significant portion of U.S. adults read comic books at least once per month. Characters first popularized by comic books have also become massively popular in other branches of the entertainment industry through a wide array of films and television shows, most notably, Marvel’s Cinematic Universe which has become the highest grossing film franchise of all time.