How was gold central to the growth of great Zimbabwe and mutapa?

Gold was central to the growth of Great Zimbabwe and the Mutapa Empire as it served as a key driver of trade and economic prosperity. The region's rich gold deposits attracted traders from across the Indian ocean, facilitating exchanges with Arab and Swahili merchants. This influx of wealth helped to establish complex societies, enhance political power, and fund the construction of impressive stone structures in Great Zimbabwe. Moreover, control over gold resources solidified the authority of local rulers, enabling the expansion and influence of both empires.