How things propagate through populations and networks — the equations with predictive teeth. Reclassified here from the marketing communication map (2026-08-05); marketing's diffusion models (diffusion-of-innovations, bass-diffusion-model) stay with marketing and link in.
- sir-information-epidemic — R₀ and the epidemic threshold, applied to information
- viral-coefficient — K = i × c, growth above and below 1
- tipping-point-critical-mass — threshold models of collective behavior
- network-scaling-laws — how network value and structure scale