Seeking Alpha
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The Gold Information Network has a 600 year silver price chart which also shows the silver/gold ratio. Congratulations to everyone who sold silver in 1500.

Throughout long periods of history both silver and gold were used as money (bimetallism) and the silver/gold ratio was pegged at ~15.5 for long periods. The current ratio is ~60 although the global aboundance of silver is only 10 times that of gold.