Mesopotamia
Mesopotamia. Mesopotamia was the earliest river valley civilization, starting to form around 4000 BCE. The civilization was created after regular trading started relationships between multiple cities and states around the Tigris and Euphrates Rivers. Mesopotamian cities became self-run civil governments.
Absolute advantage is the ability to produce more or a given product using a given amount of resources. Comparative advantage is the ability to produce a product most efficiently given all the other products that could be produced. The country still needs to trade for goods and services where it does not have a comparative advantage.
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Justinian I, Emperor of the Byzantine Empire, ordered the landmark church of Hagia Sophia in Constantinople. It was built by Greek scientists Isidore of Miletus and Anthemius of Tralles.