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Thanks to the advancements in technology, production has gotten more efficient. Also, improvements in technology and lower wages outside the US have increased globalization which hasn't helped domestic unions. - 

Sometimes it's hard for economists to put definitive lines on who qualifies as being part of the middle class. However, reports by The White House Middle Class Task Force, the Pew Research Center, the Center for American Progress, and The Brooking Institute have tried to clear up some confusion.

In this photo slideshow, we highlight some of the lesser-known facts about what makes some of us middle class.