Whether you went to public or private school, odds are you were aware of the kid who knew how to "acquire things" from time to time - and sell them to classmates. Whether it was candy or something slightly more nefarious, like test answers or illegal substances, a creepy classmate or budding entrepreneur probably had a little side business.
The school "black markets" recalled by adults on Reddit are nothing like the ominous dark market for human body parts, but some kids engaged in questionable ventures that could have led to a fate worse than detention.
From Redditor /u/f15hyf4c3:
Photos of groups of friends. I'd take pics at lunch (and sell yesterday's photos for $5 to $8) of all the little crews and cliques, develop the film in the darkroom during a free period in the afternoon, print the negatives during... photo class... sell the black-and-white 5x7s or 8x10s during lunch, then take more images. Wash, rinse, repeat.
I made hundreds of dollars, if not more (I was a spendthrift). Some adults thought it was drug-related, but no one who actually knew me. My school had 2,000 to 3,000 students; some kids bought multiple pics. I took pics of couples, but the best were groups of 10 to 15 people... [I] could make $100 on one image.
From Redditor /u/4nl4:
One kid in middle school sold Dum Dum lollipops. He carried them around in a shopping bag, and I believe he charged a quarter.
In high school, I had a friend who would sell cookies - one for 1$. Eventually, staff got wind and told her to stop. So people would give her money for no reason. And the next day she would give them cookies for unrelated reasons.
Edit: Almost forgot elementary school. Kids would sell their parents jewelry for ice cream money. One kid sold his grandmother's engagement ring for 50 cents.
From Redditor /u/wujtzr:
[Kids sold] the Wi-Fi password to the teachers' Wi-Fi network so we could use sites blocked on the student and guest networks.
[The] school kept changing it, but kids always figured it out.
From Redditor /u/jamer0658:
Teacher here. A kid at my previous school sold those little salt-and-pepper packets to kids at lunch every day: 50 cents for both. The cafeteria (due to state and federal regulations) didn’t season anything, so the food was blander than bland.
He made a few hundred dollars over the course of the month he did this before [administrators] shut him down.