The most expensive comic can change over time. It could be one that's a first edition of a highly popular and rare series, or has unique features that make it highly sought after by collectors. Factors like its condition and historical significance also play a role.
Well, it's tricky to say for sure. Sometimes a comic can be super expensive because it's a key issue in a famous storyline, or maybe it was signed by the creator. Or it could just be so scarce that its value shoots up.
I think it's hard to determine the absolute most expensive comic. It often depends on rare editions, collectibility, and market demand at a given time.