The precious metals are not an investment, but a store house of value. At today's price of silver, $23.00, one ounce of silver can buy about 2.5 gallons of milk. When inflation goes rampant because the value of money goes down, milk may cost $20 per gallon. At that time silver will likey be $50 per ounce and one ounce will still buy 2.5 gallons of milk, in this example, it will have held its value.
The same thing can be said of gold.
The precious metals have from time immemorial been deemed money. Land has from antiquity been called "REAL" estate. Put your assets in each.
Buckle up your seat belt ..... we are in for a hellova ride.
PS ..... Bitcoin is too ephemeral for me.... all you have is some ones and zeros in some computer memory chip somewhere..