He missed some of the other reasons a son-of-a-rich is more likely to have it better in the workplace: experience with business. A SOR is more likely to have grown up around people who talk the talk of high finance, and have friends with the same experience. They are more comfy with those in the business, and those in the business are more comfy with them, because they can speak the same language.

My father worked in a factory, as a member of a union, and I grew up not having the first clue about how the market or business works.

In technical fields, those who grow up in the middle class probably know someone with intricate technical knowledge, and who is a master of their art, even if it is a mechanic, electrician or HVAC repairman, and have picked up at least the feel of the technical jargon from them.

Slightly related, on This American Life over the week-end, they interviewed several people who work in finance at some of the firms who were bailed out by TARP, and they all swore that they had their high-paying job because of their superior talent, and deserved to get payed their tax-payer inflated salaries because they were smarter than most other people. They all complained that Pres. Obama was a meanie to big businesses, trying to tell them what to do and all, and should just leave them alone.