Essays in Network Economics

The thesis is composed of 4 works. The first two concern production networks: the first chapter presents a model to analyse how the network shapes market power, the second is a study of the differences of a dynamic model of shock propagation with respect to a stylized static one. The last two concern diffusion of opinions rather than shocks: the third presents a model of joint diffusion of an epidemic state and opinions about the riskiness of an available immunization, modeled as cultural norms. The last is an analysis of a informational cascade model in the presence of overreaction, a well documented fact about agents, especially in financial settings.