For classical economists, markets served the highest value buyers without anyone in the market needing to know that it was possible to write aggregate buyer reservation prices in the form, D = F (p). Cournot, thereby launched neoclassical economics as modelling and thinking of economic action in terms of their outcome effects, rather than their roots in human experience.
Smith, V. L., & Inoua, S. M. (2019). Cournot marked the turn from classical to neoclassical thinking. ESI Working Paper 19-14. Retrieved from https://digitalcommons.chapman.edu/esi_working_papers/272/