Hernan Vallejo2026-03-222026-03-222025https://revistas.unal.edu.co/index.php/ede/article/view/118740https://andeanlibrary.org/handle/123456789/79555This article develops a simple linear model of oligopoly and uses it to provide a detailed characterization of equilibrium prices, quantities, mark-ups, price elasticities of market demand; and welfare, all in terms of the parameters of the model. This is done under five different conjectures: Collusion, Threat, Cournot, Stackelberg, and Bertrand. The results of the model are used for comparative statics.esEconomicsSimple (philosophy)Mathematical economicsOligopolyEconometricsGeneral equilibrium theoryWelfare economicsMathematicsCharacterization (materials science)Stability (learning theory)article