How did the economic factors of scarcity and supply and demand affect the lives of the mountain men in the Oregon Country?
That era and lifestyle was really defined by the rise and wane in the demand for fur products, particularly hats.
The economic factor of life affect everyone in the same way. When demand for a product increases it motivated efforts for further supply. Scarcity of a resource will also drive efforts to secure more of it. Thus, the entire development of the "Mountain Man" was based initially on a particular market supply-demand issue.
Everything else that they are known for is primarily a result of simply surviving in order to fill their particular market niche. In daily life they often "lived off the land", which meant a cycle of deprivation and plenty.