Gold and silver coins sometimes mixed with copper and other precious metals indeed. Wheat and grains have not been used as currencies, certainly not for the majority of human history like gold and silver coins have. I am not sure whether to ridicule you here or to go about teaching history 101, I am a history buff myself, so I am a bit shocked that you are not aware of this well known basic fact and that you are even trying to debate this with me.
I don't care that you can use Google when your absence of logical skills refrains you from adressing the original argument.
"I am a history buff myself"

To be clear:
Your point doesn't stand because you've provided factual evidence against it: gold was never a one-size-fits-all type of deal.
In the same way Bitcoin cannot and will never accomodate all use cases
You might want to carry on pretending that everyone was using gold coins back then but certainly that would make you the idiot worthy of being ridiculed.
In those days some families whole possessions weren't worth one single gold coin.
*edit wrong meme
