Summary
This quote suggests that advanced societies tend to use gold or silver, either individually or in combination, as a form of currency. It implies that these precious metals hold intrinsic value and are widely accepted mediums of exchange within civilized nations. The reasoning behind this preference could be that gold and silver have a long history of being recognized as reliable stores of wealth and have a relatively stable value compared to other commodities. Using such metals as money provides a sense of security and stability within the economy.