Supply and Demand
Updated 2026-08-11
INTRODUCTION
English translation pending.
CORE DEFINITION
The foundational model of microeconomics, formalised in the nineteenth century and central to Charlie Munger's economic reasoning. The core claim is that price and quantity are set by the interaction of a downward-sloping demand curve and an upward-sloping supply curve, so price is an outcome rather than a decision. The key qualification is the assumption that other things are held equal: expectations, regulation and market power all move the curves themselves. Munger used the framework mainly as a first diagnostic question about any price movement.
SCAFFOLDING EFFECT
Reduce cognitive load
- Two-list split: write two possible supply causes and two possible demand causes for the move - Volume check: read quantity alongside price to separate a supply shift from a demand shift - Shock or shift: decide whether the change reverses when capacity returns or persists
Anchor fast decisions
Price is the result of the balance between two sides, not something either side sets alone. Demand slopes down and supply slopes up, and their intersection fixes the traded price and quantity. When price moves sharply, identifying whether the supply curve or the demand curve shifted separates a temporary shock from a structural change: supply shocks usually fade as capacity returns, while demand shifts often persist. Reading quantity alongside price is what makes the two distinguishable.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- mungermodels.comhttps://mungermodels.com/models/supply-and-demandverified
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