After more than four decades of serving as the nation’s economic majority, the U.S. middle class is now matched in size by those in the economic tiers above and below it.
Just what is "economic inequality"? Depends on whom you ask.
What exactly does it mean to live on $2 per day? And how does that compare with the notion of poverty in richer countries?
On a global scale, just 13% of the world’s population could be considered middle income in 2011, according to a new Pew Research Center analysis. Where do you fit?