Comment by littlestymaar

Gold is a terrible unit of international money because the supply isn't flexible enough to accommodate any growth in international trade.

Contrary to popular belief, during history gold has always had limited role in the monetary system, because it was too scarce to really be useful (in most of human history, Silver, not gold was the cornerstone of trade, and trade itself was a tiny part of economic activity in an era where most of it was subsistence farming). It's only when banking and paper money replaced silver that gold took a bigger role in the monetary system. The gold standard is in fact an invention of the late 19th century and it didn't last long before it disappeared progressively (the first world war being the beginning of the end).

Unfortunately for us, it just happened to be the period when a bunch of influential economists grew up (particularly Ludwig Von Mises), and like every human being they assumed that the system they grew up with was special and what came after was decadent, an idea that has unfortunately since then become widespread in the general population.

Most people wrongly assume that the key property for a commodity to become the basis of a monetary system is scarcity, but in reality scarcity is a drawback. Money must be abundant enough (too abundant is bad, but too scarce is even worse).