Psychology is messy. If you assume that impulse control and the ability to delay gratification is an inherited trait, then the income of parents becomes supporting evidence rather than a confounder.
Time to do some GWAS to see if there is indeed a genetic component :)
Why do people make up inherited traits and apply them as if that is a legitimate critique?
The entire reason they did the marshmallow study is because most studies on impulse control cannot avoid confounding factors.
Time value money matters if I am offering you money now vs later. E.g. if you are in debt money later effectively involves the interest earned on that money at likely 25% or worst case 900%. If you aren't in debt the alternative is investing at 7% with risk or 2-5% without risk.
Trust is incredibly important. Money now is money now, money later might be money later if they actually fulfill the promise. And this isn't income agnostic as the risk of this varies wildly based on the impact of the money. A "get back on your feet" amount of money today or a slightly larger amount in a year implies a lot more risk than some spending money on either case.
Additionally while genetic markers have sometimes been effective at predicting even those have trouble with the random nature of gene transference.
All traits, psychological or otherwise are heritable. The hard question to answer is how predictive those inherited genetics are relative to other factors.
Yes, but tiny variations in phenotype will foster rather largely different outcomes. People forget that a lot of your genetic traits are there as potential, but not as fact. Its not even necessarily and upbringing thing. Epigenetica systems, multi generation genetic markings (like famine). Its very hard to say how a certain genetic trait becomes an observed psychological trait.
Right, but I think in this case people mostly about whether there's causation. Because, if there is, then you can do an intervention to train willpower.
Time to do some GWAS to see if there is indeed a genetic component :)