This looks very naive and dated already. Basic, undergrad economics textbooks are very simplistic and most discussion is based on models with unique equilibriu

This looks very naive and dated already. Basic, undergrad economics textbooks are very simplistic and most discussion is based on models with unique equilibrium and no uncertainty involved. But serious economics is full of results on models with multiple equilibria, uncertainty, dynamics, games and what a whole lot of market imperfections. It is common to see people from other areas (specially STEM) to take the naive textbook econ as the state of the art and make critiques that where long addressed...