How did Darius help make the Middle East common market?

Darius I, the Persian king, played a pivotal role in the economic integration of the Middle East by standardizing weights, measures, and coinage across his vast empire, which included much of the region. He established a network of roads, notably the Royal Road, facilitating trade and communication. Additionally, he promoted the use of a common currency, the daric, enhancing commercial transactions and fostering economic interdependence among various cultures and regions. This infrastructure and standardization laid the groundwork for a more interconnected Middle Eastern economy.