If your mind is entirely occupied with where your next meal comes from, whether you'll make rent at the end of the month, and how you're possibly going to cope with the random accidents of life, your mind can't even afford to think about bigger plans or opportunities.
Lift people out of that misery at the bottom. Make sure everybody has access to a good education. Make sure nobody goes bankrupt due to medical emergencies. Do that, and people will have the chance to move up again.
I can name about three to four dozen recently listed (Forbes 400) US billionaires that came from poverty. You can look them up, the lists are easy to Google. Further, according to Forbes about half of their real estate billionaires come from at or below middle class, and about 40% of tech billionaires do.
How many billionaires in the Middle East aren't counted? High ranking government officials in many countries also are likely billionaires via corruption.
It's unclear what proportion would be inherited vs new wealth, but it's another dimension worth considering.
"Sixty-five percent of the ultra-rich made their own money, while an additional 16 percent inherited a portion of the wealth that they grew to a larger fortune. The self-made rich have an average net worth of $142 million, versus $130 million for those who inherited their money."
http://www.bankrate.com/financing/wealth/myths-about-the-ult...