Answer:
Gold and salt
Step-by-step explanation:
Before the Enslaved people became the preferred commodity from West Africa for Europeans, replacing "GOLD and SALT" as the most valued trade commodity.
This is evident in the fact that, before the rampant slave trade in Africa began around the 15th century, it is reported that the major trading commodities are the Gold / Salt exchange, particularly in West Africa, where the slave trade fully thrives.