Explain SMBC — the wiki for Saturday Morning Breakfast Cereal

This comic applies philosophical analysis to the game of Rock Paper Scissors. A girl declares "I threw paper. Paper beats rock!" but her opponent counters with a logical argument: rock beats scissors, which in turn beats paper, so by transitivity, rock has an equal capacity to beat paper given enough time. She then poses the deeper question: if the determiner of victory is not the players but the order of play, can they really consider the game to have reached a "meaningful conclusion"?

In the final panel, the mother yells that "Susie's using political economy to get out of doing the dishes again!" and someone responds "Tell her it's not a real science!" The comic humorously depicts a child using overly sophisticated academic reasoning to weasel out of chores, while also taking a jab at political economy (or perhaps game theory) as a discipline.