Why were beavers valuable during the westward expansion?

The beaver was the most widely sought natural resource in North America during the 1700s and 1800s, and was largely responsible for the exploration and geographic knowledge of the western United States and Canada. Pelts were made into robes, coats, and especially hats.

Explanation:

answer; /// the need to make choices because economic wants exceed economic means;

answer; answer; marginal cost;