The weather also played a very big part on trade. The location alone is a key fact in any trade system but when you're dealing with bodies of water it becomes a completely different standard. Each exchange between the Middle East and Europe through any sea had to be thoroughly planned out and equipped with the right materials for a safe arrival. The seas were not always calm enough for travelers to make it across safely and the weather did not always agree. There were many times where strong winds would wreck a trading ship and cause destruction. This would cost a lot more money than most people who were exporting would want to spend during that time.
I thought it was interesting how the weather could affect the trade system and ones power with in it. It never really occurred to me that there were such problems with high winds and rough seas because you do not hear much about travel issues like that today. Also, i find it funny how each different section of the world it going through its own time at being a hegemony. Looking towards today, and thinking about that now makes me wonder what will happen in future years to come and who will the hegemony be?