jewelry wholesale market in delhi Why is it the basis for determining the currency system as the monetary system?

wholesale jewelry from poland 1. The golden standard system refers to the currency system based on gold as the currency.
2, the silver standard system refers to a currency system based on silver as its own currency.
3, compound duplex refers to one country at the same time stipulates gold and silver as the standard coin.
4, banknotes: use banknotes as the currency. The banknote system is also called the credit system.
The currency system is usually classified by currency materials. The most basic element of the currency system is the determination of currency materials.