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Mental Models
100 models across 12 chapters — click any to start a tutoring session.
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1. Maps
2. Judgment Under Uncertainty
3. Physical Dynamics and Change
4. Evolution
5. Systems That Stabilize
6. Algorithms
7. Economics of Choice and Tradeoffs
8. Economics of Power
9. Strategy
10. Art
11. Art
12. Human Nature
Chapter 1 — Maps, Boundaries, and Foundations
The Map Is Not the Territory
Models simplify — reality is more complex
Circle of Competence
Know the edges of what you truly understand
First Principles Thinking
Reason from fundamental truths, not analogy
Thought Experiment
Use imagination to investigate the impossible
Chapter 2 — Judgment Under Uncertainty
Second-Order Thinking
Consider the consequences of consequences
Probabilistic Thinking
Estimate outcomes as distributions, not certainties
Inversion
Solve problems by thinking backwards
Occam's Razor
The simplest explanation is usually correct
Hanlon's Razor
Don't attribute to malice what's explained by incompetence
Chapter 3 — Physical Dynamics and Change
Relativity
All measurements are relative to a reference frame
Thermodynamics
Energy is conserved; entropy always increases
Inertia
Systems resist change proportional to how established they are
Friction and Viscosity
Hidden resistance accumulates in every real system
Velocity
Speed without direction is just movement
Leverage
Small inputs at the right point produce large outputs
Activation Energy
Every transition requires overcoming an initial barrier
Catalysts
Accelerate reactions without being consumed
Alloying
Combinations produce properties neither component has alone
Chapter 4 — Evolution, Ecology, and Behavioral Drivers
Reciprocity
Organisms return favors and punish defection
Evolution: Natural Selection and Extinction
Small fitness advantages compound over generations
Evolution: Adaptation and The Red Queen Effect
You must keep evolving just to stay in place
Ecosystems
Interacting components form a whole greater than its parts
Niches
Specialization allows coexistence by dividing resources
Self-Preservation
Systems are biased toward maintaining their own existence
Replication
What spreads efficiently, persists
Cooperation
Groups that cooperate outcompete purely selfish individuals
Hierarchical Organization
Complex systems organize into nested levels
Incentives
Behavior follows incentives more reliably than stated values
Tendency to Minimize Energy Output
Organisms default to the path of least resistance
Chapter 5 — Systems That Stabilize, Scale, and Break
Feedback Loops
Outputs fed back as inputs drive system behavior
Equilibrium
Systems resist displacement and return to stable states
Bottlenecks
One constraint limits the throughput of the whole system
Scale
Many properties change nonlinearly with size
Margin of Safety
Build buffers to absorb unexpected failure
Churn
The rate of loss sets a floor on growth requirements
Chapter 6 — Algorithms, Thresholds, and Mathematical Judgment
Algorithms
Explicit procedures eliminate inconsistency
Critical Mass
Systems cross thresholds that produce sudden qualitative change
Emergence
Wholes have properties their parts don't possess
Irreducibility
Some phenomena can't be explained by decomposition
Sampling
Inferences are only as good as the sample
Randomness
Many outcomes are driven by chance, not skill
Regression to the Mean
Extreme outcomes tend to move back toward average
Multiply by Zero
One fatal flaw negates all other strengths
Equivalence
Different representations can encode the same structure
Surface Area
More interface means more opportunity and more exposure
Global and Local Maxima
Local optima trap systems that only improve incrementally
Chapter 7 — Economics of Choice and Tradeoffs
Scarcity
Resources are finite relative to wants
Supply and Demand
Prices emerge from the intersection of willingness to sell and buy
Optimization
Getting the objective function wrong is worse than not optimizing
Trade-offs
More of one thing always costs something of another
Specialization
Focus on a domain unlocks disproportionate gains
Interdependence
Specialization creates efficiency and fragility
Chapter 8 — Economics of Power, Fragility, and Market Change
Efficiency
Optimization leaves no slack to absorb shocks
Debt
Borrowing against the future amplifies both success and collapse
Monopoly and Competition
Markets exist on a spectrum from pure competition to monopoly
Creative Destruction
New innovations destroy existing value while creating new value
Gresham's Law
Bad drives out good when both are treated equivalently
Bubbles
Prices detached from fundamentals always revert
Chapter 9 — Strategy, Conflict, and Adversarial Systems
Seeing the Front
Decision-makers remote from conditions operate on distorted models
Asymmetric Warfare
Weak actors can prevail by refusing to fight on the strong actor's terms
Two-Front War
Fighting multiple fronts divides resources and creates coordination failure
Counterinsurgency
Conventional superiority is insufficient against decentralized adversaries
Mutually Assured Destruction
Catastrophic retaliation capacity makes conflict irrational
Chapter 10 — Art, Perception, and Framing
Audience
Communication is shaped by who receives it
Genre
Genre sets expectations that can be met, subverted, or transcended
Contrast
Difference is perceivable only against a backdrop
Framing
How information is presented shapes how it is received
Rhythm
Patterns of repetition and variation create expectation
Melody
A continuous line gives coherence to a sequence
Chapter 11 — Art, Narrative, and Embodied Expression
Representation
All art is selective — choices reveal perspective
Plot
Causally connected events create meaning from sequence
Character
Coherent internal logic makes behavior meaningful
Setting
Context actively constrains what is possible
Performance
Live execution adds dimensions recorded work cannot replicate
Chapter 12 — Human Nature, Bias, and Misjudgment
Trust
Built slowly, destroyed quickly
Bias from Incentives
Self-interest systematically distorts reasoning
Pavlovian Association
Responses get conditioned to associated stimuli
Tendency to Feel Envy & Jealousy
Social comparison drives pain and distorted judgment
Distortion Due to Liking/Disliking
We accept arguments from people we like and reject those from people we dislike
Denial
Emotionally unacceptable realities are refused rather than processed
Availability Heuristic
We overweight vivid, recent, or memorable events
Representativeness Heuristic
We judge probability by how closely something matches a prototype
Failure to Account for Base Rates
How common something is anchors all probabilistic judgment
Tendency to Stereotype
Group characteristics applied to individuals are systematically wrong
Failure to See False Conjunctions
A specific scenario feels more probable than its components
Social Proof
Uncertainty makes us copy others
Narrative Instinct
We compulsively construct causal stories from random events
Curiosity Instinct
Intrinsic motivation to close knowledge gaps
Language Instinct
Language shapes the boundaries of thought
First-Conclusion Bias
We anchor on satisfactory answers and stop searching
Overgeneralize from Small Samples
Small samples are highly variable and unrepresentative
Relative Satisfaction/Misery
Satisfaction is a comparison, not an absolute state
Commitment & Consistency Bias
Past positions are defended beyond what evidence warrants
Hindsight Bias
Outcomes seem predictable after the fact
Sensitivity to Fairness
Humans reject unfair outcomes even at cost to themselves
Fundamental Attribution Error
We attribute behavior to character when situation is the real cause
Influence of Stress
Stress degrades cognition and reveals breaking points
Survivorship Bias
We see only the winners; the failures are invisible
Tendency to Want to Do Something
Doing nothing feels intolerable even when it's optimal
Falsification / Confirmation Bias
We seek evidence that confirms, not challenges, our beliefs