Coinage fluctuated between all gold (less frequently) or all silver (more frequently) or all paper or all Spanish for the dollar.
FORBES: 2012: Good Money And Jobs vs. Easy Money And Stagnation
There was no paper, copper, or silver just thirty-one thousand lines of code and an announcement on the Internet.
NEWYORKER: The Crypto-Currency
Paper currency began as warehouse receipts for specified weights of gold or silver.
FORBES: Rethinking Money: The Rise Of Hayek's Private Competing Currencies
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