Silk Road Han to Ming dynasty Zhang Qian's mission west, the Han Protectorate of the Western Regions, and Tang Chang'an as a meeting place of Eurasian merchants. Merchant Guild Commerce Ming dynasty to Republican era Shanxi merchants rising by the grain-for-salt system and Huizhou merchants by Huai salt, bound into groups by home place and clan. Currency Evolution Shang dynasty to present Money over the ages, from Shang cowries and Qin banliang coins to Ming silver. Jiaozi Banknotes Northern Song to Ming dynasty The official jiaozi of Northern Song Yizhou, backed by iron cash: the world's earliest government-issued paper money. Shanxi Remittance Houses Qing dynasty to Republican era Shanxi remittance houses sent money between cities by draft and branch without carrying silver, 'remitting throughout the realm'. Contractual Credit Culture Western Zhou to present Land deeds, partnership and hiring papers, from the Qiu Wei vessel inscription to Turpan contracts and Huizhou documents. Marketplace Hubs Song dynasty to present From Northern Song Bianjing, with shops opened along the streets, to Jiangnan market towns of shops fronting workshops. Salt & Transit Monopolies Han dynasty to present State monopoly of salt and iron from Emperor Wu of Han, salt monopoly under Tang, and customs duties as sources of state revenue. Tea-Horse Frontier Trade Tang to Qing dynasty State-run trade of central tea and silk for frontier horses, also used to keep the border stable. Lineage Trust Funds Northern Song to modern era Fan Zhongyan's charitable estate at Suzhou, whose field income supported kinsmen, later followed by Jiangnan clans.