In what way did the Romans affect the Sahara trade?

The Garamantes provided the Romans with foodstuffs, exotic Sub-Saharan slaves & possibly textiles, salt, gold & ivory in exchange for Roman wine, olive oil & pottery. ... Although a large amount of Sub-Saharan goods made it to the Mediterranean, Mediterranean goods did not reach the Sub-Sahara in the same volume.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.