The ONLY thing linking them is that their prices are bound together. Oh, and that they are both called "silver".
Paper silver drives the price today. That won't be much longer (see Basel-3 Tiered assets, and moves to base currencies to PMs - like Russia is doing, and consider Rule 589 and NESARA).
In 1960 an oz of Silver was 92 cents per oz
A gallon gasoline was 31 cents per gallon.
An oz of silver could buy 3.22 gallons of gasoline.
Currently:
Silver is $21.60 per oz.
A gallon of Gas in California is $6.40.
An oz of silver can buy 3.37 gallons of gasoline. Obviously in some states it could buy a little more gasoline.
Silver and gasoline are always changing in value compared to each other. But after 72 years they are almost the same value compared to each other.
Silver is money and a commodity, it is not an investment. The same can be said for Gold. Although Gold is really not a commodity.
The only metal I have bought that did anything was the four tons of aluminum I bought prior to the child groper’s administration. And the carbide cutters in my machine shop.