Can't say that I agree that in an end game scenario platinum will be the most valuable metal , far from it .....
Just because the metal is rarer than gold does not mean that it will be, or should be, priced higher than gold.
Platinum has always been just an industrial metal, expensive due to its scarcity, and necessity in vehicle emission control
measures, particularly in diesel powered vehicle ( which production is declining rapidly world wide ).
It was never an monetary metal, although the Russians tried to make it one by issuing platinum roubles during the 1800s,
(unsuccessfully, I might add) and platinum's use in jewelry is negligible at best.
And as others have said, good luck trying to sell it for a good price if you need funds in a hurry.
I tested this out a few years ago here in Melbourne, with a one ounce platinum and a one ounce palladium coin.
One dealer who I was selling a lot of gold at spot price to did not wish to purchase either, even at under spot prices.
A couple of the other buyers offered me 10% under spot for the platinum and 20% under spot for the palladium!
So its buyers and investors beware.
Why would you wish to gamble on platinum and palladium, when you have silver and gold, with 6,000 years of
solid monetary history behind them to invest in ?