The classical and Post-classical periods in history had a closeness, yet, both time periods were highly distinctive. The economies both had high-points, as well as times where it was thought the empire would fail. The social structures took on many adjustments, due to particular forces such as war and religion. Religion, in order to have an impact on the social structures, was constantly being introduced to different views, such as Buddhism and Christianity. Politics and technologies were still finding new advancements. With the help of the new technology they were able to find out more intellectual discoveries.
Socially, the world has changed drastically. In the beginning of the Classical Era, people were stratified into tribes depending on their bloodline. They were born into this, and couldn’t leave it. Even as the world evolved, civilizations were still stratified, but in a more structural manner. All depending on where that person was located, whether it be Europe or even China, social stratification was always apparent. Communication had also become more advanced, resulting in the advancement of the Era itself. With Communication becoming more imaginative and intellectual, ideas of improving the world around became more common, and helped ideas spread and ascend through the Eras.
During the classical era, and even in the very beginning of the post classical era, trade and economics did not play a large role in the lives of the people, and didn't until large and dominant civilizations gained the need for trade to sustain themselves. New ideas and innovations like the silk road showed the importance of trade in the later civilizations, however there was nothing like this within the classical period. In the post classical period, increased agricultural production made possible by the developing technologies led to a great economic development. This furthered economic development in turn led to the greater development of trade.