Other than goods & wealth, what was one thing that was exchanged on islamic trade routes?

Answer

Other than goods and wealth, Slaves was also exchanged on Islamic trade routes.  

Explanation:

Islamic trade refers to the commerce and trade that Islamic territories had with other territories like Africa, Europe, and some parts of Asia. There was an exchange of  textiles, horses, sugar, spices, slaves etc on the Islamic Trade Route.

In that times of no stable means of propagation, traders used to play a key role in spreading of the religion, culture and knowledge of one place to other, as they travel extensively to various places.  Islamic connotations guided the traders on fair trade however not all traders were Muslims.