在漫长的货币史中,货币形式固定在何种材料上经历了一个发展和选择的过程。牲畜、贝壳、皮毛、粮食等都曾做过货币。如16世纪西班牙人使用过皮革货币,西太平洋雅浦岛上使用过石币,我国春秋战国时期流通贝币等等。在世界不同地区货币形式多种多样,相伴流通。但是这些货币材料自身都存在着一些缺陷。如容易损坏、不易保值、携带困难、流 In the long history of money, the monetary form is fixed on what kind of material has undergone a process of development and selection. Livestock, shells, fur, food, etc. have done money. Such as the 16th century Spanish used leather currency, the West Pacific Yap Island used stone coins, China’s Spring and Autumn Period War Bell circulation and so on. In different parts of the world a variety of forms of currency, accompanied by circulation. However, these monetary materials have their own defects. Such as easy to damage, not easy to preserve, carry difficulties, flow