Path Dependence
Type: Systems & Dynamics
Local HTML: path_dependence.html
Definition
History matters — past decisions constrain present options. Small early events can cascade into major outcomes.
Brian Arthur’s work: “Increasing returns” mean early advantages compound. The first to get ahead tends to stay ahead.
Why It Matters
Technology: QWERTY keyboard (designed to slow typing) persists because everyone uses it. Economics: Cities that industrialized first remain economic centers. Biology: Evolution is path-dependent — can’t go back, only forward from current state. Personal: Career choices, relationships, habits — early decisions shape everything.
Examples
| Early Event | Locked-in Outcome |
|---|---|
| VHS vs Betamax | VHS won, though Betamax was better |
| Light rail gauge | Roman chariot width → train tracks |
| Software ecosystems | iOS vs Android duopoly |
| Academic fields | Disciplines shaped by founding figures |
Types
First-degree: Direct — early choice affects later options Second-degree: Indirect — early choice affects what choices even seem possible
Fighting Negative Path Dependence
- Recognize lock-in — Are you stuck because of history?
- Calculate switching costs — Sometimes worth paying
- Create new paths — Disrupt from outside
- Design for flexibility — Don’t over-constrain future options
Related Biases
- [[Lock-in Effect** — Specific type of path dependence
- [[Sunk Cost Fallacy** — Sticking with path because of investment
- [[Status Quo Bias** — Preferring current path
Audio
Podcast episode: Path Dependence
Part of the Cognitive Bias Reference