The Roman economy was underdeveloped and underachieved, as subsistence agriculture, urban centers that consumed more than they produced in terms of trade and industry, low-status artisans, slowly developing technology, and a lack of economic rationality
Some cities were known for particular industries or commercial activities, and the scale of building in urban areas indicates a significant construction industry. Papyri preserve complex accounting methods that suggest elements of economic rationalism and the Empire was highly monetized. Although the means of communication and transport were limited in antiquity, transportation in the 1st and 2nd centuries expanded greatly, and trade routes connected regional economies
Economic dynamism opened up one of the avenues of social mobility in the Roman empire. Social advancement was thus not dependent solely on birth, patronage, good luck, or even extraordinary ability.
Although aristocratic values permeated traditional elite society, a strong tendency toward plutocracy is indicated by the wealth requirements for census rank. Prestige could be obtained through investing one’s wealth in ways that advertised it appropriately grand country estates or townhouses, durable luxury items such as jewels and silverware, public entertainments, funerary monuments for family members or coworkers, and religious dedication such as altars. Guilds and corporations provided support for individuals to succeed through networking, sharing sound business practices, and willingness to work.
A major difference between the two superpowers and their respective empires was that the Roman Empire was culturally much more diverse than that of Iran. The Parthians and later the Sasanians, the dynasties that ruled Iran in this period, ruled over a population that was largely Iranian. The Roman Empire, by contrast, was a mosaic of territories and cultures that were chiefly bound together by a common system of government. Many languages were spoken in the empire, but for the purposes of administration Latin and Greek were the most widely used, indeed the only languages.
The upper classes of the east spoke and wrote in Greek, those of the west in Latin, and the boundary between these broad language areas ran somewhere across the middle of the Mediterranean, between the African provinces of Tripolitania (which was Latin speaking) and Cyrenaica (Greek-speaking). All those who lived in the empire were subjects of a single ruler, the emperor, regardless of where they lived and what language they spoke.