Black markets in everything
With candy sales banned on school campuses, sugar pushers are the
latest trend at local schools. Backpacks are filled with Snickers and
Twinkees for all sweet tooths willing to pay the price. "It’s created a little underground economy, with businessmen
selling everything from a pack of skittles to an energy drink,” said
Jim Nason, principal at Hook Junior High School in Victorville.
Here is more, with a thanks to Eric Nielsen for the link. I would put it this way: school kids are more economically advanced than astronauts.