h i g h l i g h t s• The paper approaches sentiment transition in a complex network.• Agents are classified in neutral, optimists and pessimists.• In continuous-time, the model delivers a stable steady-state outcome.• In discrete-time, stability holds under a homogeneous network of degree one.• Endogenous cycles emerge in discrete-time for a connectivity degree larger than one. a r t i c l e i n f o
t r a c tConsider a network connecting individual agents that are endowed with distinct sentiments or 'views of the world'. Specifically, assume that each node in the network contains an agent that, at a given period t, can be found in one of five states: sentiment neutrality, exuberant optimism, non-exuberant optimism, exuberant pessimism and nonexuberant pessimism. Local interaction rules, similar to those one encounters in rumor propagation models, make agents change their sentiment as they contact with others. Under a continuous-time framework, the proposed setting delivers a stable fixed-point equilibrium, meaning that the shares of agents in each sentiment category will converge to constant steady-state levels. The inspection of the same structure of analysis in discretetime indicates that the stability outcome continues to hold when the connectivity degree is equal to 1. However, this result might change as one considers higher-order connectivity. In this last case, persistent endogenous waves of optimism and pessimism emerge under a reasonable parameterization of the model.