David Barker quotes Imran Hosein in his book "The Gold Dinar and Silver Dirham." as he identifies six traits common to all of these that amount to a definition of money in Islam.
1- Money is either precious metals or food.
2- Money is abundant and freely available.
3- Money is durable and does not spoil or corrode.
4- Money has intrinsic value.
5- Money exists in creation and is made valuable by God.
6- Money functions as a medium exchange.
However, Mr. Barker disputes the first trait.
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