Final answer:
Both the Silk Roads and the Indian Ocean trade fostered hubs of commercial interaction involving diverse merchant populations that exchanged luxury goods and facilitated cultural exchange, with Muslim merchants playing a significant role in their expansion.
Step-by-step explanation:
One similarity between the commercial interactions in the regions surrounding the Persian Gulf and the Silk Roads was the presence of a diverse merchant population facilitating trade in luxury goods across a network of regions. Both routes attracted merchants from various regions, including Central Asia, the Middle East, and farther areas like China and Europe, in the case of the Silk Roads.
This connection fostered a cultural exchange and cosmopolitan cities, where people of different ethnicities and religions coexisted and traded goods ranging from spices and textiles to precious metals and stones. The Indian Ocean trade along the coast and the Silk Roads had in common the involvement of Muslim merchants, who played a crucial role in the expansion of these trade routes, which was made possible by the political stability provided by the Islamic caliphates, as well as the establishment of infrastructure like roads and rest houses to support travelers and commerce.