The renowned marshmallow test goes belly-up, failing to forecast individuals' future. https://anderson-review.ucla.edu/new-study-disavows-marshmallow-tests-predictive-powers/…https://sciencedirect.com/science/article/pii/S0167268119302641…
The "Marshmallow Test" doesn't test economic time discounting. It tests trust in the fulfillment of promises from authority.
Anybody who's been poor knows the marshmallow in your mouth can't be taken back the way the ten promised in an hour can be.
Stop pretending that's dumb.