Daron Acemoglu, professor of MIT, answers a big question, "what makes us rich?".
He says incentive is the key role in what makes us rich or poor:
People need incentives to invest and prosper; they need to know that if they work hard, they can make money and actually keep that money. And the key to ensuring those incentives is sound institutions — the rule of law and security and a governing system that offers opportunities to achieve and innovate. That's what determines the haves from the have-nots — not geography or weather or technology or disease or ethnicity.
Put simply: Fix incentives and you will fix poverty. And if you wish to fix institutions, you have to fix governments.
Very simple answer!