Story highlights New PwC report has sought out the best cities for investors in Africa

North African capitals dominate, but there are signs that sub-Saharan cities will come into their own in the near future

(CNN) For the first time in history over half the world's population live in cities -- more than 54% of us did in 2014.

Mass urbanization is proving to be "the single most important transformation" the world is seeing in the 21st century, according to Jamal Saghir, director of sustainable development at the World Bank, and it shows no signs of letting up. By 2050, the U.N. predicts 66% of us will call a city our home.

It is generally accepted that cities are the engines of economic growth, and nowhere are these engines firing harder, or populations growing faster, than in the developing world.

With burgeoning higher education systems and enviably young workforces, African cities in particular are booming. Commended for their diversity, adaptability and enterprise , investors are taking note.

Global auditing firm PwC has now quantified and ranked Africa's urban hubs in a new report listing the continent's top "Cities of Opportunity."

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