- Finance: As per article family financial support can get people over one of the biggest hurdles of getting a business off the ground. Also coming from an upper income family odds are you have a higher income and more savings to invest/risk.
- People they grew up around: If you grow up around people owning/running companies you are more likely to see this as a reality for yourself. You also have personalities to emulate in chasing this goal.
- History of tech: Wealthier families has more access to tech in the past, although changing today. In my school age most kids didn't have access to their own computer, even at uni. This would be a barrier to leaning about IT that could build future behavior.
- Connections: Growing up in a privileged environment you develop connections that can be useful. Also learn how to behave among people who are in a position of power to help you and develop the 'we are similar people' bond.
- Sense of Entitlement: A great line from Rory Sutherlands TED talk was Oxford/Cambridge doesn't buy you a great education, it buys you a great sense of entitlement. This give you confidence to go achieve great things. In my small world I have clearly seen this difference from people who grew up on different side of the tracks though it seems to be changing a bit now.
- Expectations: People growing up in a more privileged world have higher expectations placed on them. To a degree this can push people to try harder to build something significant rather than just reach a reasonable level of comfort a more general job will offer.
- Fallback Option: I imagine this is one of the more important, people from a comfortable family know if their venture goes south they wont be homeless. Their family/friends will make sure they have board, food and an ability to restart. This puts them in a position to risk all with out the same downside.