This is well-documented in Humankind: A Hopeful History by Rutger Bregman. It's worth a read, as it also dispels other experiments in human behaviour that have

This is well-documented in Humankind: A Hopeful History by Rutger Bregman. It's worth a read, as it also dispels other experiments in human behaviour that have subsequently been difficult to replicate (for a variety of reasons). https://www.goodreads.com/book/show/52879286-humankind https://www.goodreads.com/book/show/52879286-humankind