I misspoke, and you raise a good point. I meant gift economies, and that error is on me. And those are pretty well-documented. I’ll stick to my firsthand experiences:

• Waianae, Oahu in Hawaii. The weekly take-what-you-need-bring-what-you-can food exchanges there are a huge stopgap for food insecurity and also spur community bonding
• Burning Man - TTITD, regionals, and much of the hippie festival circuit have a robust gifting culture