The cheque had its origins in the ancient banking system, in which bankers would issue orders at the request of their customers, to pay money to identified payees. Such an order was referred to as a bill of exchange. The use of bills of exchange facilitated trade by eliminating the need for merchants to carry large quantities of currency (e.g. gold) to purchase goods and services. A draft is a bill of exchange which is not payable on demand of the payee. (However, draft in the U.S. Uniform Commercial Code today means any bill of exchange, whether payable on demand or at a later date; if payable on demand it is a "demand draft", or if drawn on a financial institution, a cheque.)