An employee of a money changer counts U.S. dollar notes for a customer, as Indonesian rupiah is seen in the background, in Makassar January 31, 2013. (reuters.com)
It would also be more cost - effective: US dollar notes drop out of circulation within around two years due to wear and tear, but coins last decades. (newscientist.com)
Australian dollar notes are made of a polymer, which has a waxy feel, while the banknotes of the U.S. and several other countries are made of cotton fiber paper. (cnbc.com)