Going Viral: Stability of Consensus-Driven Adoptive Spread
For researchers studying social influence and product adoption, this work provides theoretical stability guarantees for a combined opinion-adoption model, though it is incremental as it extends existing epidemic and opinion dynamics frameworks.
The paper analyzes a coevolutionary model of complex contagion combining SIS epidemic spreading with consensus opinion dynamics, providing Lyapunov-based stability conditions for all-adopt and none-adopt equilibria. Numerical simulations confirm sociological adoption patterns.
The spread of new products in a networked population is often modeled as an epidemic. However, in the case of `complex' contagion, these models {do not capture nuanced, dynamic social reinforcement effects in adoption behavior}. In this paper, we investigate a model of complex contagion which allows a coevolutionary interplay between adoption, modeled as an SIS epidemic spreading process, and social reinforcement effects, modeled as consensus opinion dynamics. Asymptotic stability analysis of the all-adopt as well as the none-adopt equilibria of the combined opinion-adoption model is provided through the use of Lyapunov arguments. In doing so, sufficient conditions are provided which determine the stability of the `flop' state, where no one adopts the product and everyone's opinion of the product is least favorable, and the `hit' state, where everyone adopts and their opinions are most favorable. These conditions are shown to extend to the bounded confidence opinion dynamic under a stronger assumption on the model parameters. To conclude, numerical simulations demonstrate behavior of the model which reflect findings from the sociology literature on adoption behavior.