During the Golden Age of comics , which began with the launch of Superman in 1938, comic books were consumed in the same way as most periodicals. They were printed monthly on cheap paper and meant to be consumed and then disposed, much like a newspaper or an issue of People Magazine. And like most magazines still today, they didn't get re-printed. Before the rise of the 'trade paperback' (or trade) popular back issues were often difficult to track down and expensive. Eventually publishers realized they could re-print collections of popular past issues and make more money. Initially only the most popular stories and issues were re-printed in trades, but eventually it became common practice to reprint nearly every series in trade form. Trades are generally printed on higher quality paper, contain full story arcs, which were initially spread over five to six individual issues which often ended with cliffhangers in order to hook the reader on purchasing the ...