Vikings were prolific traders and influenced the economic development of Europe. Vikings used mostly silver in their own economy, in ingots or bars. They imported spices from Chinese and Persian traders in Russia, and prized glass and silk.
They exported items like cloth, wool, fur, amber, walrus ivory, wax, salt, cod, and down (feathers), and were also involved in the slave trade. They also traded among themselves, especially wool for clothing and Viking ship sails.