The paper's abstract [1] doesn't conclude that affluence is the source of delay gratification. Nor could it, using only this experiment. Even if a correlation

The paper's abstract [1] doesn't conclude that affluence is the source of delay gratification. Nor could it, using only this experiment. Even if a correlation is found, correlation does not imply causation. One could equally suspect that delay gratification leads to affluence (assuming parent-child similarity, whether by nature or nurture), or a third factor affecting both, etc. [1]: http://journals.sagepub.com/doi/abs/10.1177/0956797618761661 http://journals.sagepub.com/doi/abs/10.1177/0956797618761661