American comic book Kane and Bill Finger created Batman, who debuted in "Detective Comics" #27 (1939). The period from the late 1930s through roughly the end of the 1940s is referred to by comic book experts as the Golden Age of comic books. It featured extremely large print-runs, with "Action Comics" and "Captain Marvel" selling over half a million copies a month each; comics provided very popular cheap entertainment during World War II especially among soldiers, but with erratic quality in stories, art, and printing. In the early 1940s over 90 percent of girls and boys from seven to seventeen read comic books.
American comic book wake of television and the impact of the Comics Code Authority. The late 1950s and the 1960s saw a superhero revival, and superheroes remain the dominant character archetype in the 21st century. Some fans collect comic books, helping drive up their value. Some have sold for more than US $1 million. Comic shops cater to fans, selling comic books, plastic sleeves ("bags") and cardboard backing ("boards") to protect the comic books. An American comic book is also known as a floppy comic. It is typically thin and stapled, unlike traditional books. American comic books are one of the three major