Mental Models (Collected from Almanack)

Naval explicitly names the models he loads. He treats his own tweets as compact mnemonics — pointers to underlying experience, not standalone wisdom.

Sources of models he cites

• Evolution + game theory + Charlie Munger ("very good investor; tons and tons of great mental models").
• Nassim Taleb ("great mental models").
• Benjamin Franklin.

"I basically load my head full of mental models."

Specific models he uses

Evolution

• A lot of modern society explains via mate allocation: sperm abundant, eggs scarce.
• "Civilization exists to answer the question of who gets to mate."
• Evolution + thermodynamics + information theory + complexity = predictive power across many life domains.

Inversion

• Don't ask what will work; eliminate what won't.
• "Being successful is just about not making mistakes."

Complexity theory

• Helps Naval operate "in the face of ignorance." We are fundamentally bad at predicting the future.
• Built him a system that respects the limits of prediction.

Microeconomics + game theory

• Foundational for navigating business + capitalism.
• Supply/demand, labor-vs-capital, game theory — extremely useful.

Principal-agent problem

• "Single most fundamental problem in microeconomics."
• Caesar: "If you want it done, then go. If not, then send."
• Principals (owners) optimize for the asset; agents optimize for themselves.
• Smaller company → everyone feels like principal.
• Tighten compensation-to-value link → people behave more like principals.

Compound interest

• Finance + intellectual domain. 100-user business growing 20%/month → millions of users quickly.
• See Compound Interest (Life).

Basic math

• Probability + statistics > calculus. Arithmetic, probability, stats forwards/backwards/inside-out.

Black swans (Taleb)

• Tail-event probability. Extreme outcomes dominate.

Falsifiability (Popper)

• "Least understood, most important principle for anyone claiming science."
• If no falsifiable predictions, not science. Naval rejects macroeconomics on this basis.

Calculus (principles, not technique)

• Understand rates of change, small discrete or continuous events. Don't waste time on integrals.

Naval's meta-rule for mental models

"I use my tweets and other people's tweets as maxims that help compress my own learnings and recall them. The brain space is finite — you have finite neurons — so you can almost think of these as pointers, addresses, or mnemonics to help you remember deep-seated principles where you have the underlying experience to back it up."

"If you don't have the underlying experience, then it just reads like a collection of quotes."

Related

• Judgment — mental models are the substrate for judgment.
• Clear Thinking Protocol — they're tools for first-principles thinking.
• Reading Protocol — how the models are acquired.

Sources: [Almanack pp106-110]