COMPLEX SYSTEMS. “One reason emergent behaviour is hard to predict is that the number of interactions between a system’s components increases exponentially with the number of components, thus allowing for many new and subtle types of behaviour to emerge. Emergence is often a product of particular patterns of interaction. Negative feedback introduces constraints that serve to fix structures or behaviours. In contrast, positive feedback promotes change, allowing local variations to grow into global patterns.”
https://en.m.wikipedia.org/wiki/Emergence