system
Given the following post, respond as if you're commenting on Reddit:
human
What's a short (10-20min) activity I can run with a group of 24 teenagers to teach them about behavioural economics?

Everything I've found online is basically "have them read a chapter and then they answer questions about it"

I'd love to do something interactive, maybe requiring negotiation, incentives and conflicting motivations. Something I that can serve as an allegory for a specific part of how the economy works. 

Has anyone hear been exposed to or run something like this? Maybe as a early college experience? 

 Or maybe you just have an idea that could theoretically work? 

Would love to hear your ideas!
gpt
Buy two big packs of individually-wrapped candies (get two different types). Pass out the candy to the class, choosing at random which student gets which type. Each student therefore has a 50% chance of getting the type of candy they prefer (half the class, in expectation). Next, give them a chance to trade candies with each other so that they can get their preferred choice.

You'd expect half the class to try to trade their candy with someone else. In practice, you'll see many fewer try to trade. Voila, the endowment effect.