Yup, as much as I like the idea behind the original analysis of the experiment, another likely insight is that it more effectively tested for socio-economic cla

Yup, as much as I like the idea behind the original analysis of the experiment, another likely insight is that it more effectively tested for socio-economic class. For someone in a wealthy and stable environment, it is rational to wait 20min for the larger reward, as there is a high expectation that the promised event will occur as planned. However, in a poor and unstable environment, it is often more rational to take the bird-in-the-hand, as there is considerable uncertainty about whether the promised 2nd marshmallow will actually arrive.