As far as I have understood: Some poor kids don't wait for the second marshmallow because they don't trust the promise they will get the second marshmallow if t

As far as I have understood: Some poor kids don't wait for the second marshmallow because they don't trust the promise they will get the second marshmallow if they wait. They aren't impulsive. They consider carefully the risks and decide it's better to have a marshmallow now, because what if the adult just takes the marshmallow away when he returns? After all this is what they experience every day: non-trustworthy adults. This is both sad and fascinating. Sad because it's a terrible world for children not to trust people. Fascinating because the conclusion is a lot more deep than I would have expected. Half a year ago I tried this experiment with my three year old son. He waited for the second cookie. Now I realize that I also tested his trust. He was trusting me and therefore willing to wait for the second cookie.