Startups are one of the only mechanisms doing that in our contemporary financial pyramid economy. They are one of the only true class mobility engines left.
Are you being sarcastic? I can't believe anyone would really believe this. Look at the profiles of successful VC-funded startup founders[0], it's all about pedigree:
"Yet on close inspection, the evidence suggests that the keys to success in the start-up world are not much different than those of many other elite professions. A prestigious degree, a proven track record and personal connections to power-brokers are at least as important as a great idea. Scrappy unknowns with a suitcase and a dream are the exceptions, not the rule.
...
That means the founders had held a senior position at a big technology firm, worked at a well-connected smaller one, started a successful company already, or attended one of just three universities - Stanford, Harvard and Massachusetts Institute of Technology."
No, and I meant relatively speaking compared to other mechanisms. Startups mint new money rather than enrich old money, and they create high paying jobs.
I was mostly responding to your comment about class mobility. I don't consider a system that semi-randomly catapults a few ivy leaguers from already-wealthy families into the ranks of billionaires to be a "true class mobility engine".
Class mobility at the highest echelons -- say hundred-thousandaires to millionaires or billionaires -- helps class mobility overall by introducing new ideas and by enriching people who still remember what it was like to not have near-infinite supplies of money and power.
If you have a society where the top echelons are locked down, it won't be long until this caste system trickles down to the rest of the culture.
It's not everything and class mobility at lower levels of society is probably more important, but it's not a bad thing either.