The vast majority of Traders that focus their operation on Mediterranean coast of Africa and trans-Saharan caravan trade came from the middle east.
When business transaction occurred between these traders and African people, they socialize with one another. Over time, this created a cultural diffusion between them. The threaders share a lot of their cultures to the African people, including their religion. This was the reason why this trade Help to popularize Muslim in this region.
An inheritance school involves the move for the benefits of the profits generated from the business and an invisible hand school is the natural forces that self regulates the economy and associate with the self-interest actions of the individual decision making.