In the online precious metals blogosphere, a lot of people say stuff like
"The historical ratio of gold to silver is 15. Therefore, if the current price of gold is $1,250, then the price of silver should be $1,250/15 = $88.33".
This thinking is flawed.
First, history is not guaranteed to repeat itself. Second, markets determine price. Well, maybe a mix of markets alongside the actual underlying fundamentals. And last, their bias makes them believe/hope that it is silver to go up, and not gold to go down, to keep the gold to silver ratio at 15. They bought and are therefore cheerleading silver or maybe they even have a realized or unrealized loss on silver they are trying to recoup.
Here's an example. Say the current market price of gold is $1,250 and the current market price of silver is $14.75. They believe that silver's price "should" be $1,250/15 = $88.33. However, why isn't it that gold should be 15*$14.75 = $221.25 ? Note that $1,250/$88.33 = 15 and also that $221.25/$14.75 = 15. That is, either way, the gold to silver ratio is 15.
Ok, yes, I do believe an increase in the price of silver is more likely in the long run (but who knows in the short run) than a decrease in the price of gold. But still, just appealing to a ratio, any ratio, as if that determines the future, does not make much sense.
Moreover, the so-called historical ratio of gold to silver is an estimate in the first place. While the majority of people say the ratio is 15 or 16, I have seen some people using other values.
As an intellectual exercise, what is the ratio for the predicted silver and gold prices to be equal?
We know that Gpred = Sspot * Ratio and Spred = Gspot / Ratio,
and we want to solve Gpred = Spred for Ratio.
Sspot * Ratio = Gspot / Ratio
Sspot * Ratio^2 = Gspot
Ratio^2 = Gspot/Sspot
Ratio = (Gspot/Sspot)^.5
Using current spot prices, we get
Ratio = ($1,250/$14.75)^.5 = 9.21
Using that ratio would make Gpred = Spred = $135.78
Let's call the ratio (Gspot/Sspot)^.5 "R star", or R*. What is one possible interpretation of R*? If you believe that ratios determine the future and that the price of silver can never be higher than the price of gold, an interpretation of R* is that it gives a prediction on what the maximum price of silver can be, given the current price of gold of $1,250, and the current price of silver of $14.75.
If R* is smaller than, in this example, 9.21, then the price of silver is greater than the price of gold, which we're assuming is not allowed. If R* is larger than 9.21, then the price of silver is less than the $135.78 calculated above. This is why R* gives a predicted maximum on the price of silver.
I can say 100% confidently that the ratio and the spot prices will fluctuate. You're welcome.
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