How is gold and salt equally important and of value

The people who lived in the desert of North Africa could easily mine salt, but not gold. They craved the precious metal that would add so much to their personal splendor and prestige. These mutual needs led to the establishment of long-distance trade routes that connected very different cultures.

Explanation:

i honestly have no idea

i am a priest who cares deeply about the church. i have been called here to explain my views on indulgences and other proposed reforms. i would like to explain why my views are consistent with the bible and are correct.