According to the U.S. cartoon show "Rocky and His Friends", the world's economy is primarily driven by what form of currency?

On the 1960 U.S. cartoon show "Rocky and His Friends", it was stated that the world's economy is primarily driven by cereal boxtops (a proof of purchase marker), as a form of currency. Standard types of currency based on gold, silver, or even uranium were not the mainstay.

Within the first episode of the show that started airing after school, Rocky and Bullwinkle in 'Box Top Robbery' find that Fiduciary Blurt, the head of the World Economic Council, has informed members that someone is flooding the market with counterfeit box tops. This could devastate the world economy. Suspicion falls on Bullwinkle; he has amassed tens of thousands of box tops. It is found that Bullwinkle got his fortune legitimately.

After his name has been cleared he is asked to appear before the Council as an expert. Blurt also summons his chief security officers, Hemlock Soames and Dr. Watkins, who are actually Boris and Natasha in disguise. They are in fact the box top counterfeiters. With some effort, Rocky and Bullwinkle discover the counterfeiters and their hiding place. Boris and Natasha's printing press ends up being destroyed by Rocky and Bullwinkle. The heroes are in the end given a parade and awarded medals before they can head off into the sunset.