BONUS: We Buy A Superhero

Comic book publishers like Marvel and DC sit on a treasure trove: thousands and thousands of comic book characters. Pieces of intellectual property. You know the big ones--Superman, Ironman, Captain America. They each make millions off of movies and merchandise. But for every marquee character, there are hundreds of others sitting unused.

NPR's Planet Money team wondered: with all those superheros stowed away, why not convince Marvel to sell them one?

Listen to the entire Planet Money superhero series here.