adults have less than $1,000 to their names.t you can maintain self- control, psychologist walter mischel told me... te>> you have got a much b chance of taking the future into account and likely to have better economic outcomes. >> reporter: mischel, who died last week, is known for an experiment he first ran at stanford in 1960 with fo o to six years, and that you're probably familiar with: the marshmallow test, which i ran on age appropriate grover.ll i ive you a marshmallow now, or if you wait a little while, i will give you two marshmallows, but only if you wait. >> two marshmallows. d reporter: would it be h wait? >> it would be very hard to wait, yes.ow you you know, just looking at this marshmallow right now makes me want that marshmallow right now. >> reporter: leaving aside the dubious charms of the foodstuff, the marshmallow test is actually among the most famous and replicated in the history of psychology. >> there's a marshmallow. you can either wait, and i will bring you back anothn one, so you ve two, or you can eat it now. >> i will save it. >> okay, i will be back. >> rep