Markets

A market is a system for coordinating decentralized economic decisions through price signals. Buyers and sellers interact without centralized direction, and prices emerge from the aggregate of their individual valuations, constraints, and expectations. The market is one of the canonical examples of self-organization in social systems: global allocation patterns emerge from local exchange without any participant intending the global pattern.

The systems-theoretic interest in markets lies in their capacity to process information that is distributed across millions of agents and cannot be centralized. Prices summarize local conditions — scarcity, demand, production costs, risk — into signals that guide behavior. Friedrich Hayek argued that this information-processing function is the market's fundamental virtue: no planner can possess the local knowledge that prices encode.

Markets also exhibit the pathologies of self-organizing systems: information cascades where agents follow prices rather than private information, bubbles where self-reinforcing expectations detach prices from fundamentals, and market failures where individual rationality produces collective irrationality. The 2008 financial crisis is the paradigmatic case of the latter.