A man walks past a graffiti by Greek street artist Achilles, depicting a zero Euro coin in Athens, Greece, June 26, 2015. (Photo by Alkis Konstantinidis/Reuters)





Gold bullion is displayed at Hatton Garden Metals precious metal dealers in London, Britain July 21, 2015. (Photo by Neil Hall/Reuters)





A taxi driver has the roof of his vehicle decorated with bank notes from around the world while working in Bangkok,Thailand July 20, 2016. (Photo by Jorge Silva/Reuters)





A man walks past a poster of an one hundred thousand rupiah bank note inside Indonesia's central bank, Bank Indonesia, in Jakarta, Indonesia July 21, 2016. REUTERS/Iqro Rinaldi





An image of Queen Elizabeth is seen on a printing plate during an event at the Bank of England in central London, Britain September 6, 2016. (Photo by Dylan Martinez/Reuters)





A construction worker is seen in front of the construction of a new “CIB” Commercial International Bank building covered with an image of the U.S. dollar in Cairo, Egypt July 26, 2016. (Photo by Amr Abdallah Dalsh/Reuters)





A towel with a print of the Nigerian naira is displayed for sale at a street market in the central business district in Nigeria's commercial capital Lagos February 4, 2016. (Photo by Akintunde Akinleye/Reuters)





Sri Lankan currency notes are seen in a bucket at a fruits stall near a main market,in Colombo, Sri Lanka, July 29, 2016. (Photo by Dinuka Liyanawatte/Reuters)





A money changer displays U.S. and Iranian banknotes at the Grand Bazaar in central Tehran October 7, 2015. (Photo by Raheb Homavandi/Reuters)





Tourists from Argentina are pictured on Ipanema Beach in Rio de Janeiro, Brazil on July 30, 2016. (Photo by Nacho Doce/Reuters)





An attendant holds a bitcoin sign during the opening of Hong Kong's first bitcoin retail store February 28, 2014. (Photo by Bobby Yip/Reuters)





A Saudi man shows Saudi riyal banknotes at a money exchange shop, in Riyadh, Saudi Arabia January 20, 2016. (Photo by Faisal Al Nasser/Reuters)





A teller in a money changer prepares Indonesian rupiah notes for a customer in Jakarta, Indonesia September 1, 2016. (Photo by Iqro Rinaldi/Reuters)





A money changer counts Turkish lira bills at an currency exchange office in central Istanbul, Turkey, August 21, 2015. (Photo by Murad Sezer/Reuters)





A man walks past a currency exchange bureau advertisement showing images of the U.S dollar and other currencies in Cairo, Egypt August 3, 2016. (Photo by Mohamed Abd El Ghany/Reuters)





Zimbabweans hold placards during a protest against President Robert Mugabe government's handling of the economy in Harare, Zimbabwe, August 3, 2016. (Photo by Philimon Bulawayo/Reuters)





A street side restaurant owner holds a bundle of Indian currency notes as he sits outside his restaurant in New Delhi November 22, 2013. (Photo by Adnan Abidi/Reuters)





An employee is seen walking over a mosaic of pound sterling symbols set in the floor of the front hall of the Bank of England in London, Britain 25, 2008. (Photo by Luke MacGregor/Reuters)





Women walk past a money changer in the central shopping district in Kuala Lumpur, Malaysia, August 21, 2015. (Photo by Olivia Harris/Reuters)





Workers count Yemeni currency at the Central Bank of Yemen in Sanaa August 24, 2016. (Photo by Khaled Abdullah/Reuters)





A man counts his money in central Kiev, Ukraine August 31, 2016. (Photo by Gleb Garanich/Reuters)





Bank of England Museum curator Jenni Adam, shows off the waterproof properties of the new polymer five pound note during an event at the Bank of England in central London, Britain September 6, 2016. The new note will be released next week. (Photo by Dylan Martinez/Reuters)