# Simple Contagion **Entity class:** Diffusion model **Maturity:** Developed ## Definition A **simple contagion** can spread after one sufficient exposure, making long weak ties effective transmission routes. Information awareness and some low-cost behaviors may approximate this model. High-cost identity or violent behavior usually requires the reinforcement represented by [[wiki/Complex Contagion|complex contagion]]. ## Relationships - **contrasted with:** [[wiki/Complex Contagion|Complex Contagion]]. - **used in:** [[wiki/Network Epidemiology|Network Epidemiology]]. - **terrorism application:** [[wiki/Terror Contagion Hypothesis|Terror Contagion Hypothesis]]. ## Sources / Provenance - [[research/A Network-Epidemiological Analysis of Radicalization and Real-Time Counterterrorism Observability|Network-Epidemiological Analysis]]