Where Are All The Upward-Sloping Supply Curves?

In every current economics textbook, authors envision upward-sloping supply curves, where suppliers’ prices go up with increasing quantities.  I found an example of one here: (https://lnkd.in/ehA3aez), where the increasing costs from left to right by mine form such a curve.

Has anyone found such curves outside of mining and refining?

If so, please let me know.


#mining #refining #prices #supply #supplycurve