Chapter 12 cross- cultural exchanges on the silk road. Long- distance travel in the ancient world: lack of police enforcement outside of established settlements, changed in classical period. People traveled to spread religion and make money. Trade networks develop: dramatic increase in trade due to greek colonization, maintenance of roads, bridges, discovery of monsoon wind patterns, increased tariff revenues used to maintain open routes. The basis of an empire is to gain revenue. Spices, pepper, cosmetics, gems and pearls: persia, egypt. Wine, oil, jewelry, art: development of professional merchant class. The silk roads: named for principal commodity from china, dependent on imperial stability, overland trade routes from china to roman empire, sea lanes and maritime trade as well. Organization of long- distance trade: divided into small segments, tariffs and tolls nance local supervision, tax income incentives to maintain safety, maintenance of passage.