71% of the world's population lives on less that $10 a day. 

More than 2/3's of the world's population remain low-income or poor, living off $10 or less a day, according to a new Pew Research Center report that looked at changes in income for 111 countries between 2001 and 2011.

Unlike in America, where the middle class has been on the rocks in recent years, some researchers say that strong economic growth in developing countries has helped shrink poverty and expand the middle class globally.

But Pew disagrees, calling a global middle class more promise than reality. True, the global middle class nearly doubled over the decade to 13% in 2011, but it still represents a small fraction of the world's population.

http://money.cnn.com/2015/07/08/news/economy/global-low-income/index.html