The Credit System was a system devised by Kahm to decide which show to watch when two shows in the show roster aired on TV at the same time. Credits were merchandise of the show, but did not include things like stand-alone trading cards or magazines. Toys, VHS tapes, DVDs, and video games were typical "credits". Dragonball Z has always been ranked at the top of the list, followed by Pokemon and then Yu-Gi-Oh!.