The market cap of a commodity such as gold could mean the price per ounce multiplied by all ounces in existence. Or, it could mean the price per ounce multiplied by all ounces in investable form (coins and bullion).
Like exchange-traded funds (ETFs), [Exchange Traded Commodities] ETCs shares are listed and traded
on exchanges like shares of stock, with prices fluctuating based on
price changes of the ETC's underlying commodities. Unlike ETFs, ETCs
are structured as notes, which are debt instruments underwritten by a
bank for the issuer of the ETC, but which are backed ...
A sudden drop like you see in March of 2018 is usually due to bad data.
The funky data before 1/18/18 is often caused for two reasons:
There was a reverse split and the data provider didn't handle it properly
There was a security with the same symbol prior to 1/18/18 and it was delisted, perhaps due to bankruptcy or a merger. The data provider then ...
I bought Krugerrands 20 years ago and sold a few at a time over the course of a few weeks for about $400 short of the 2011 peak. I got a triple from them so no complaints.
My exit was a local guy who owned a stationery store in town and his cut was $25 off of spot price which I verified before going to the store. Perhaps I could have saved $5 or $10 by ...