Robin explains the sharing economy to the rest of the Teen Titans, as they are unfamiliar with it. He makes sure to show how much money he made through his participation, which entices the other Titans to join. Robin then demonstrates how to participate in the sharing economy: using a smartphone application. Cyborg uses the app to rent out his left arm to Beast Boy.
Kramer brags to Jerry that he's taken up Karate and is dominating his dojo. Jerry discovers that Kramer is in a class of 6-year-old children. This illustrates the idea that sometimes size and scale are important. If you're the biggest kid on the block, you might have a competitive advantage.