# Bounded Rationality Bounded Rationality is a concept introduced by [[Herbert Simon]] that challenges the classical economic assumption of perfectly rational decision-makers. Simon argued that humans cannot optimize decisions because they face three fundamental constraints: limited information, limited cognitive capacity, and limited time. Instead of maximizing, people "satisfice"—choosing options that are good enough rather than searching for the best possible outcome. This concept revolutionized economics, earning Simon the Nobel Prize in Economics (1978), and influenced [[Cognitive Psychology]], organizational theory, and [[Artificial Intelligence (AI)]]. While classical economics assumed humans were rational utility maximizers with complete information, bounded rationality recognizes that real decision-making is shaped by cognitive limitations, environmental complexity, and the costs of gathering information. The concept provides a more realistic model of human behavior. ## Classical vs Bounded Rationality | Aspect | Classical Rationality | Bounded Rationality | |--------|----------------------|---------------------| | Information | Complete | Limited, costly | | Computation | Unlimited | Cognitively constrained | | Time | Unlimited | Scarce | | Goal | Optimize (find best) | Satisfice (find good enough) | | Model | Homo economicus | Real humans | | Outcome | Optimal solution | Satisfactory solution | ## The Three Bounds ``` ┌─────────────────────────────────────────────────────┐ │ BOUNDED RATIONALITY │ ├─────────────────┬─────────────────┬─────────────────┤ │ Information │ Cognition │ Time │ │ Constraints │ Constraints │ Constraints │ ├─────────────────┼─────────────────┼─────────────────┤ │ • Incomplete │ • Limited │ • Deadlines │ │ • Uncertain │ working memory│ • Opportunity │ │ • Costly to │ • Processing │ costs │ │ acquire │ limits │ • Decision │ │ • Asymmetric │ • Attention │ fatigue │ │ │ limits │ │ └─────────────────┴─────────────────┴─────────────────┘ ``` ## Satisficing Simon's alternative to optimizing: > "Decision makers can satisfice either by finding optimum solutions for a simplified world, or by finding satisfactory solutions for a more realistic world." **Process**: 1. Set an aspiration level (what's "good enough") 2. Search through alternatives 3. Accept first option meeting the aspiration level 4. Stop searching **Example**: Hiring - Optimizing: Interview all candidates, rank them, select best - Satisficing: Interview until finding someone who meets requirements, hire them ## Heuristics Bounded rationality leads to the use of heuristics—simple rules that work well under constraints: | Heuristic | Description | Example | |-----------|-------------|---------| | **Recognition** | Choose recognized option | Buy familiar brand | | **Take-the-best** | Decide on single best cue | Choose by one key feature | | **Tallying** | Count positive features | Choose option with most pros | | **Default** | Stick with status quo | Keep current provider | ## Implications | Domain | Impact | |--------|--------| | **Economics** | Behavioral economics field emerged | | **Organizations** | Realistic models of firm behavior | | **AI** | Agent-based modeling, satisficing algorithms | | **Public Policy** | Nudge theory, choice architecture | | **UX Design** | Reduce cognitive load, provide defaults | ## Related Concepts - **[[Decision fatigue]]**: Quality degrades with many decisions - **[[Cognitive biases]]**: Systematic deviations from rationality - **[[Heuristics]]**: Mental shortcuts for decisions - **[[Prospect theory]]**: [[Daniel Kahneman]]'s work on risk decisions - **[[Nudge theory]]**: Using bounded rationality to improve choices ## Criticisms - Some argue humans can be rational in the right environments - "Ecological rationality": Heuristics can be optimal for specific environments - Difficult to define "good enough" objectively - May underestimate human reasoning in some domains ## References - Simon, H. (1955). "A Behavioral Model of Rational Choice" - Simon, H. (1956). "Rational Choice and the Structure of the Environment" - https://en.wikipedia.org/wiki/Bounded_rationality ## Related - [[Herbert Simon]] - [[Decision Making]] - [[Cognitive Psychology]] - [[Daniel Kahneman]] - [[Behavioral Economics]] - [[Heuristics]] - [[Decision fatigue]] - [[Nudge theory]] - [[Prospect Theory]]