Yes, gold is a medium of exchange. One that apparently lost what looks like 50% of its value between 1913 and 1920, according to your chart in post #25.
They are mediums of exchange, neither gold nor FRN’s are stocks. ( English language has different words for different things, unlike, say, Arabic. ).
Yes, gold is a medium of exchange. One that apparently lost what looks like 50% of its value between 1913 and 1920, according to your chart in post #25.