Complexity Economics

Complexity economics is an approach to economic analysis that treats the economy not as a system in equilibrium but as a complex adaptive system in constant flux. It emerged from the intersection of game theory, agent-based modeling, and the study of complex systems at the Santa Fe Institute in the 1980s, partly as a response to the limitations of the Arrow-Debreu general equilibrium framework.

The core claim is that economic order is not imposed by market clearing but emerges from decentralized interactions among heterogeneous agents who learn, adapt, and form expectations that change the environment to which they are adapting. This produces disequilibrium dynamics — persistent innovation, boom-and-bust cycles, and structural change — that equilibrium models treat as anomalies to be minimized rather than as the normal operating mode of actual economies. Complexity economics is not merely a critique of neoclassicism; it is an alternative formal framework that replaces the optimization metaphor with the adaptation metaphor.