[citation needed] Islam considers commodities with intrinsic value as currency.
[citation needed] The following are some examples of commodities that can be used as currency: gold (as Gold Dinar), silver (as Silver Dirham), dates, wheat, barley, and salt.
The mentioned six items are derived from a hadith[citation needed] i.e. gold, silver, dates, wheat, barley, and salt and were used as money in barter system.
[1] The price of a commodity is set by the market as long as fiat currency (paper) is not used.
On the other hand, the price/value of commodities can be manipulated/adjusted by the creators of fiat money (by virtue of the market law of supply and demand).