Final answer:
The trade that contributed to Ghana's economic growth was the trans-Saharan trade in gold, ivory, and slaves. During the medieval period, Ghana was a major center for trade in West Africa, and the gold trade brought significant wealth to the empire.
Step-by-step explanation:
The trade that contributed to Ghana's economic growth was the trans-Saharan trade in gold, ivory, and slaves.
During the medieval period, Ghana was a major center for trade in West Africa. The empire controlled the trade routes that passed through its territory, connecting the Sahara Desert with the forest areas of West Africa.
The Arab merchants in the Islamic states of North Africa were particularly interested in sub-Saharan gold, which they bought from Ghana. The gold trade brought significant wealth to Ghana and contributed to its economic growth.