Capitalism has failed

Marshmallow "Delayed Reward" Experiment replication
http://journals.sagepub.com/doi/abs/10.1177/0956797618761661
https://news.ycombinator.com/item?id=17218250

reference for original test;
https://en.wikipedia.org/wiki/Stanford_marshmallow_experiment
tl;dr pocket-protected autists in labcoats with a budget for a few pounds of marshmallows tried a """psychological""" test("Can a child resist eating a marshmallow for future reward") only to discover rich kids steamroll it. Their conclusion: Capitalism is unfair, straight outta childs mouth.

This test is horribly flawed from several points:

1.Use something more universally liked, like potato chips or some popular snack, but not something common brand they eat all day.
A lot of kids don't like marshmallows(I was disgusted with one when i first tasted it).
Rich kids probably never eat such cheap junk.

2.Use a pack of it and check if it was opened. A single marshmallow is worth the wait for reward.
A rich kid wouldn't care about some single marshmallow. But a tempting pack of some rare snack will work.

3.More time for wait:30m at least so they get hungry. Kids are not all impatient as it seems, in my time i could wait hours for opportunity to get something for free.

4.Make the reward non-food item: like
a cute plush toy or something kids like, like a cool fidget spinner.
Making the reward to seem like another portion of the same distorts motivation.

>>3
OP was nitpicking methodology and making a wild extrapolation.