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UNSPECIFIED - : Banknote, 1 dollar, USA (series 2003) with recto : portrait of George Washington (1732-1799) and verso : the Symbol of the The Bavarian Illuminati secret society (1776-1785) and the seal of USA (Photo by Apic/Getty Images)

UNSPECIFIED - :  Banknote, 1 dollar, USA (series 2003) with recto : portrait of George Washington (1732-1799) and verso : the Symbol of the The Bavarian Illuminati secret society (1776-1785) and the seal of USA  (Photo by Apic/Getty Images)

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SEOUL, SOUTH KOREA - MARCH 12: A bank employee counts U.S. dollars banknotes at the headquarters of the Korea Exchange Bank March 12, 2003 in Seoul, South Korea. The dollar began stronger against the won amid a bleak economic outlook and the growing concerns over the North Korean nuclear crisis, closing at 1,245 won per dollar, up 15.10 won. (Photo by Chung Sung-Jun/Getty Images)

SEOUL, SOUTH KOREA - MARCH 12:  A bank employee counts U.S. dollars banknotes at the headquarters of the Korea Exchange Bank March 12, 2003 in Seoul, South Korea. The dollar began stronger against the won amid a bleak economic outlook and the growing concerns over the North Korean nuclear crisis, closing at 1,245 won per dollar, up 15.10 won.  (Photo by Chung Sung-Jun/Getty Images)

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Pile of $1 bills

Pile of $1 bills

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Paying digitally

Paying digitally

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U.S. one-hundred dollar bills are arranged for a photograph in Hong Kong, China, on Monday, July 20, 2015. The yuan has proven to be among the more resilient emerging-market currencies this year, having fallen less than 0.1 percent versus the dollar as China cut interest rates and the U.S. prepared to raise. Photographer: Xaume Olleros/Bloomberg via Getty Images

U.S. one-hundred dollar bills are arranged for a photograph in Hong Kong, China, on Monday, July 20, 2015. The yuan has proven to be among the more resilient emerging-market currencies this year, having fallen less than 0.1 percent versus the dollar as China cut interest rates and the U.S. prepared to raise. Photographer: Xaume Olleros/Bloomberg via Getty Images