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Comparison of Stable and Unstable Equilibria

The distinction between stable and unstable equilibria can be understood both technically and intuitively. Technically, in a dynamic price model, the difference is shown by the slope of the Price Dynamics Curve (PDC). A stable equilibrium has a PDC that is flatter than the 45-degree line, ensuring the system self-corrects after a shock. Conversely, an unstable equilibrium is characterized by a PDC steeper than the 45-degree line, causing the system to move further from its initial state after a disturbance. Intuitively, a stable equilibrium is like a strong friendship that withstands challenges, while an unstable equilibrium is like a fragile one that breaks at the first sign of trouble.

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Updated 2026-05-02

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