Comment by _kblcuk_

"Marshmallow test": https://en.wikipedia.org/wiki/Stanford_marshmallow_experimen...

It was also highlighted (recently?) iirc that it has little to do with discipline and will-power, but is surprisingly affected whether kids come from wealthy / "good" families (and thus can trust grown ups) vs kids coming from poorer / "troubled" families (and thus just leap at the opportunity and don't trust that they will actually get another marshmallow if they will wait).