Gold 
There is no doubt that gold and silver prices have been sensationally volatile in terms of paper currencies, especially as you compare their values over a long period. Just fifty years ago, thirty-five U. S. dollars were exchanged for one troy ounce of gold. These days, you need somewhere about 1,700 to 1,900 dollars for an ounce. In other words, a dollar buys just 2% of the gold it once did five decades ago.
Silver, like gold, is a universally accepted tangible precious commodity and store of wealth. It’s value has tracked gold's value, for the most part, and not the value of a paper currency. Five decades ago, 1.8 U. S. dollars were exchanged for one troy ounce of sliver and now you need about 18-25 dollars for an ounce.
One can point to a longstanding value of gold as being about 15 times that of silver since ancient times, but that is, shall we say, ancient history. In recent history, gold has been valued at an average of about 60 times silver, where silver outperforms gold in times of metals-favored trends. In 2011, in the bullish market after the financial crisis, gold's comparative value fell to below 35 times silver. In other words, silver outperformed gold at that time.
In unfavored bullion market trends, silver has been generally neglected and has become relatively cheap compared to gold. The market statistical term used to view silver in terms of gold is the gold/silver ratio. The higher the ratio the more expensive gold looks, and the more attractive silver looks. Since 2011, silver has become relatively undervalued in terms of gold.
