Bounded Rationality

Bounded rationality is the theory, introduced by Herbert Simon in 1955, that the rationality of decision-making agents is constrained by three interconnected limits: the information available to them, the cognitive limitations of their minds, and the time within which they must act. The bounded agent does not optimize — they satisfice: they search for a solution that is good enough given available resources rather than the best possible solution. Simon coined the term as a direct challenge to the neoclassical economic assumption of the omniscient utility-maximizer, whose ability to access complete information and compute optimal strategies is not a simplifying idealization but an empirically false description of how decisions are actually made.

Bounded rationality is not a deficiency. It is the structure of rational agency in environments where information is costly, time is limited, and the search space is too large for exhaustive exploration. Heuristics are the cognitive mechanisms bounded rationality produces: simplified decision procedures that exploit regularities in the environment to achieve good outcomes without complete optimization. The adaptive toolbox of ecologically rational heuristics is not a collection of biases — it is a collection of solutions to the problem of decision-making in a complex world with finite resources. Whether bounded rationality produces good decisions depends on whether the agent's heuristics match the structure of the environment they are navigating — a design question, not a failure question.