Explain the practice of transhumance and its
associated patterns for different nomadic herders

Just do the math, then think

Cthat is the answer

This could be considered an example of astrology.

If a particular resource is not useful or needed then the price would be considerably low. once that resource is needed the price or value will raise depending on how useful or needed it is especially if the resource is low in quantity, the consumers would pay whatever they have to, to get that material.