The whole point of entrepreneurship is persistence, you don't need anything else. If you have persistence, then IQ, upbringing, social environment, education dwarf in importance. If you simply never stop, try things that no one else has tried before, it's impossible to not become successful. :)
"If you have persistence, then IQ, upbringing, social environment, education dwarf in importance." Politely disagree here. Most people who succeed in business are usually (but not in all cases) brought up in good homes, in stable social environments and receive good educations. Pull beneath the curtain and even the 'high school/college drop out' is usually from a middle class home or has received private education. T…
There's a lot to be said about what the makeup of the S&P 500 CEO pool represents, and what it means to look at their educational background, etc.
BUT... It's also important to remember that setting the bar for "success as an entrepreneur" at anything involving the S&P 500 may be a bit excessive. Oh, don't get me wrong... many entrepreneurs (especially tech entrepreneurs, which probably includes a lot of the population here) may have goals to build a publicly traded company, be a member of the S&P 500, or the DJIA or whatever. But not all entrepreneurs fit that mold.
Depending on where you start out and what your goals are, building a company that brings in just enough income to pay you and your employees, while allowing you to avoid being outdoors doing backbreaking manual labor in 95 degree heat, may qualify as "success". Heck, for a tradesman of some sort (plumber, electrician, etc.) it may be enough to have a business that just keeps the lights on for him and his family, while leaving enough to put some money in a college fund for the kids.
However, please do not be so dismissive of IQ or social environment or education. All of these things play a key role.
They can, but don't overstate their importance either. I've seen with my own eyes the value of sheer perseverance, coupled with great work ethic, and how that allowed a man with almost no formal education, and a poor, rural, "lower class" upbringing to become what I consider a "successful entrepreneur". I don't know my dad's IQ though, so I won't comment on that bit.