Final answer:
The most significant advantage for Constantinople’s trade was its strategic location that controlled key trade routes connecting Europe and Asia. Its prosperity, impregnable defensive system, and well-regulated economy through an organized system of guilds also contributed to its success as a major trade hub.
Step-by-step explanation:
The biggest advantage for trade that Constantinople had was its strategic location. This location controlled access to key trade routes, namely the Bosphorus and Dardanelles straits, which connected the Mediterranean Sea with the Black Sea and thus, served as the gateway between Europe and Asia. This not only placed Constantinople at the heart of East/West trade but also made it an essential terminal of the famed Silk Road, facilitating a thriving economy with diverse trade goods from far-reaching places.
Furthermore, the city's prosperity was evident through its population, impressive size, and wealth, all of which contributed to its standing as a key commercial hub during the time. With its strong defensive fortifications described in figure 13.6.1, and being impregnable for centuries, Constantinople was able to maintain a stable and flourishing trade environment despite being surrounded by potential threats.
Constantinople's economy was highly regulated by the imperial government and an organized system of guilds, like the one dedicated to trade in Eastern goods, which helped in ensuring consistent tax revenues. Additionally, the city's vibrant cash economy was bolstered by exclusive commodities such as silk, which, after silkworms were smuggled out of China, provided a lucrative source of wealth through an imperial monopoly on the European silk industry.