Thanks for stating the obvious: yes, it was merely a guess. But I am qualified by the measure that I personally grew up poor, like many others, and so can vouch

Thanks for stating the obvious: yes, it was merely a guess. But I am qualified by the measure that I personally grew up poor, like many others, and so can vouch reasonably in the author's favor regarding the reality of his statements. Insofar as anyone would deny the concept of "mindset inequality" as it relates to one's intellect and poverty, I am perfectly comfortable making uneducated guesses about their upbringing.