This photo combo of file images shows U.S. presidential candidates Donald Trump, left, and Hillary Clinton. Income inequality has been a rallying cry of the 2016 election, with more Americans turning fearful and angry about a shrinking middle class. Trump has pledged to restore prosperity by ripping up trade deals and using tariffs to return manufacturing jobs from overseas. Clinton has backed a debt-free college option and higher minimum wages to help the middle class. (AP Photo/Mary Altaffer, Chuck Burton)