Purplefarm Library
Hidden Patterns of Thinking, Behavior, and Decisions
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Rule Gallery
Core Idea
Good to Know
Hidden Gem
All
Psychology
Psychology
Behavioral Science
Behavioral Science
Social
Social
Management
Management
Economics
Economics
Science
Science
Systems
Systems
Psychology / Medicine / Behavioral Science
Psychology / Medicine / Behavioral Science
Rule 001.
Placebo Effect
Mathematical theorem / social choice theory
Mathematical theorem / social choice theory
Rule 002.
Arrow's Impossibility Theorem
Social psychology
Social psychology
Rule 003.
Aronson Effect
Psychological influence / Social influence / Cognitive psychology
Psychological influence / Social influence / Cognitive psychology
Rule 004.
Suggestion Effect
Informal adage; risk-management heuristic
Informal adage; risk-management heuristic
Rule 005.
Murphy's Law
Management principle; organizational behavior concept
Management principle; organizational behavior concept
Rule 006.
Peter Principle
Sociological principle / cumulative advantage mechanism
Sociological principle / cumulative advantage mechanism
Rule 007.
Matthew Effect
Motivation theory
Motivation theory
Rule 008.
McClelland's Law
Organizational behavior; sociology; public administration
Organizational behavior; sociology; public administration
Rule 009.
Goal Displacement
Motivation theory / Humanistic psychology
Motivation theory / Humanistic psychology
Rule 010.
Maslow's Hierarchy of Needs
Technology principle / empirical observation
Technology principle / empirical observation
Rule 011.
Moore's Law
Social influence; persuasion; marketing psychology
Social influence; persuasion; marketing psychology
Rule 012.
Celebrity Effect
Social inequality / organizational behavior / workplace discrimination
Social inequality / organizational behavior / workplace discrimination
Rule 013.
Glass Ceiling Effect
Cognitive bias / psychological effect
Cognitive bias / psychological effect
Rule 014.
Barnum Effect
Popular psychology; Behavioral influence; Consumer behavior
Popular psychology; Behavioral influence; Consumer behavior
Rule 015.
Birdcage Effect
Economics; Decision-making; Statistics / Regression Analysis
Economics; Decision-making; Statistics / Regression Analysis
Rule 016.
Marginal Effect
Heuristic / Reasoning Principle; Philosophy of Science; Logic and Problem Solving
Heuristic / Reasoning Principle; Philosophy of Science; Logic and Problem Solving
Rule 017.
Occam's Razor
Social psychology metaphor; Group behavior pattern; Negative comparison mindset
Social psychology metaphor; Group behavior pattern; Negative comparison mindset
Rule 018.
Crab Effect
Business theory; market structure; digital economics
Business theory; market structure; digital economics
Rule 019.
Long Tail Theory
Heuristic / decision-making principle / statistical observation
Heuristic / decision-making principle / statistical observation
Rule 020.
Pareto Principle
Management principle; Organizational behavior; Productivity heuristic
Management principle; Organizational behavior; Productivity heuristic
Rule 021.
Parkinson's Law
Supply chain phenomenon / operations management concept
Supply chain phenomenon / operations management concept
Rule 022.
Bullwhip Effect
Psychological effect; Cognitive / social bias; Self-fulfilling prophecy
Psychological effect; Cognitive / social bias; Self-fulfilling prophecy
Rule 023.
Pygmalion Effect
Social theory; criminology; urban governance; management analogy
Social theory; criminology; urban governance; management analogy
Rule 024.
Broken Windows Theory
Unknown
Unknown
Rule 025.
Zeigarnik Effect
Cognitive bias / social influence / behavioral economics
Cognitive bias / social influence / behavioral economics
Rule 026.
Bandwagon Effect
Cognitive bias; Social influence; Persuasion principle
Cognitive bias; Social influence; Persuasion principle
Rule 027.
Authority Effect
Social Psychology / Communication Theory
Social Psychology / Communication Theory
Rule 028.
Group Pressure
Economic / Financial Market Effect
Economic / Financial Market Effect
Rule 029.
Contagion Effect
Social psychology; interpersonal attraction
Social psychology; interpersonal attraction
Rule 030.
Pratfall Effect
Causal reasoning; systems thinking; mental model
Causal reasoning; systems thinking; mental model
Rule 031.
Domino Effect
Cognitive bias / social judgment effect / affective influence
Cognitive bias / social judgment effect / affective influence
Rule 032.
Emotional Effect
Marketing Strategy / Branding Principle
Marketing Strategy / Branding Principle
Rule 033.
Positioning
Management principle / disciplinary fairness principle
Management principle / disciplinary fairness principle
Rule 034.
Hot Stove Rule
Motivation theory; management principle
Motivation theory; management principle
Rule 035.
Locke's Law
Management principle / decision-making aphorism
Management principle / decision-making aphorism
Rule 036.
Watch Law
Cognitive bias; memory effect; social judgment effect; order effect
Cognitive bias; memory effect; social judgment effect; order effect
Rule 037.
Primacy Effect
Motivation psychology; social psychology; behavioral science
Motivation psychology; social psychology; behavioral science
Rule 038.
Deci Effect
Management concept / strategy metaphor
Management concept / strategy metaphor
Rule 039.
Flywheel Effect
Consumer behavior; economics; pricing psychology
Consumer behavior; economics; pricing psychology
Rule 040.
Veblen Effect
Classical management theory
Classical management theory
Rule 041.
Fayol's Principle
Learning / Motivation / Management Psychology
Learning / Motivation / Management Psychology
Rule 042.
Feedback Effect
Social psychology; group dynamics; motivation loss
Social psychology; group dynamics; motivation loss
Rule 043.
Social Loafing
Psychological concept / psychoanalytic interpretation
Psychological concept / psychoanalytic interpretation
Rule 044.
Freud's slip of the tongue
Cognitive bias; memory heuristic; behavioral decision theory
Cognitive bias; memory heuristic; behavioral decision theory
Rule 045.
Peak End Law
Cognitive bias; social perception bias; rating error.
Cognitive bias; social perception bias; rating error.
Rule 046.
Halo Effect
Economic law / monetary principle
Economic law / monetary principle
Rule 047.
Gresham's Law
Communication Principle / Interpersonal Psychology
Communication Principle / Interpersonal Psychology
Rule 048.
Body Language
Motivation psychology; cognitive bias / behavioral effect
Motivation psychology; cognitive bias / behavioral effect
Rule 049.
Overjustification Effect
Defense mechanism; social perception bias
Defense mechanism; social perception bias
Rule 050.
Projection Effect
Cognitive psychology; educational psychology; learning and memory
Cognitive psychology; educational psychology; learning and memory
Rule 051.
Overlearning Effect
Research methodology; social science concept
Research methodology; social science concept
Rule 052.
Cohort Effect
Psychology experiment / cognitive psychology concept
Psychology experiment / cognitive psychology concept
Rule 053.
Sensory Deprivation Experiment
Cognitive bias / avoidance behavior / decision-making metaphor
Cognitive bias / avoidance behavior / decision-making metaphor
Rule 054.
Ostrich Policy
Scientific principle / systems thinking concept
Scientific principle / systems thinking concept
Rule 055.
Butterfly Effect
Research bias / behavioral reactivity / organizational psychology
Research bias / behavioral reactivity / organizational psychology
Rule 056.
Hawthorne Effect
Management metaphor / talent-attraction principle; scientific analogy
Management metaphor / talent-attraction principle; scientific analogy
Rule 057.
Tide Effect
Social psychology / aggression / priming effect
Social psychology / aggression / priming effect
Rule 058.
Weapon Effect
Social psychology / organizational behavior principle
Social psychology / organizational behavior principle
Rule 059.
Bad Apple Rule
Safety management heuristic
Safety management heuristic
Rule 060.
Heinrich's Law
Behavioral economics; behavioral finance; social psychology
Behavioral economics; behavioral finance; social psychology
Rule 061.
Herding Theory
Learning effect / developmental behavior
Learning effect / developmental behavior
Rule 062.
Imprinting Effect
Psychology principle / performance psychology
Psychology principle / performance psychology
Rule 063.
Yerkes-Dodson Law
Economic / behavioral / institutional persistence effect
Economic / behavioral / institutional persistence effect
Rule 064.
Ratchet Effect
Cognitive Bias / Memory Effect
Cognitive Bias / Memory Effect
Rule 065.
Recency Effect
Psychological experiment / behavioral science concept
Psychological experiment / behavioral science concept
Rule 066.
Delayed Gratification Experiment
Philosophical / scientific reasoning principle
Philosophical / scientific reasoning principle
Rule 067.
Law of Cause and Effect
Business maxim / strategic management heuristic
Business maxim / strategic management heuristic
Rule 068.
Fast Fish Law
Management metaphor; teamwork principle
Management metaphor; teamwork principle
Rule 069.
Flying Geese Effect
Cognitive psychology / creativity principle
Cognitive psychology / creativity principle
Rule 070.
Incubation Effect
Game theory; asymmetric game; Nash equilibrium example
Game theory; asymmetric game; Nash equilibrium example
Rule 071.
Smart Pig Game Theory
Cognitive Bias / Social Psychology
Cognitive Bias / Social Psychology
Rule 072.
Stereotype Effect
Cognitive bias / Memory effect / Encoding effect
Cognitive bias / Memory effect / Encoding effect
Rule 073.
Self-reference Effect
Unknown
Unknown
Rule 074.
Zero-Sum Game
Social psychology
Social psychology
Rule 075.
Diffusion of Responsibility Effect
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