A deepening and widening of networks of human interaction within and across regions contributed to cultural, technological, and ________ within and between various societies.Improved commercial practices led to an increased volume of trade and expanded the geographical range of existing trade routes- including the Silk Roads- promoting the growth of powerful new trading cities.The growth of interregional trade in luxury goods was encouraged by innovations in previously existing transportation and commercial technologies, including the caravanserai, forms of credit, and the development of money economies.