Path Dependence

One-Sentence Definition

Past choices constrain current options, and historical paths influence future directions.

Core Concept

Path dependence refers to the phenomenon where once a path is entered, dependence on that path develops, making it difficult to switch even when better alternatives exist. The QWERTY keyboard is a classic example.

What Problem Does It Solve

When information is incomplete, options are numerous, or risks are unclear, it helps pull your judgment from intuition back to structured analysis.

More specifically, path dependence is suited for answering questions like: How can I better understand the current situation? How can I make more reasonable judgments and take appropriate actions?

When to Use

• When problems become complex and intuitive judgment is no longer reliable.
• When the team disagrees on next steps and needs a shared analytical framework.
• When you need to translate abstract judgments into concrete actions, checklists, or experiments.
• When existing practices are losing effectiveness and the underlying logic needs re-examination.

When Not to Use

• The problem is simple, and direct execution is more important than analysis.
• Basic facts are lacking, and you are merely spinning concepts.
• The model is used only to confirm existing conclusions, rather than to help refine judgment.

Summary

Recognizing path dependence can help us make more deliberate choices at critical junctures and also understand why change is so difficult.