Tinbergen Rule
Updated 2026-07-31
INTRODUCTION
English translation pending.
CORE DEFINITION
The Tinbergen Rule, formulated by the Dutch economist Jan Tinbergen, holds that reaching N independent policy objectives requires at least N independent policy instruments. If targets outnumber independent tools, the problem is underdetermined and the objectives cannot all be achieved simultaneously. The key qualifications concern independence on both sides: the targets must be genuinely distinct, and the instruments must affect them through separate channels. Where instruments overlap or targets are correlated, the effective count falls and the constraint binds sooner.
SCAFFOLDING EFFECT
Reduce cognitive load
- Instrument Count: Count independent tools before committing to a fixed list of policy targets. - Target Triage: Decide which objectives to subordinate when the available tools fall short. - Independence Test: Check whether two instruments genuinely move different levers rather than one.
Anchor fast decisions
Each independent target adds one degree of freedom to the problem, and each independent instrument supplies one degree of control. When controls are fewer than constraints, the system has more conditions than variables and no setting of the instruments satisfies all targets at once. The result is not poor execution but mathematical impossibility, which is why adding effort to an underdetermined system produces trade-offs rather than progress. Adding a genuinely independent instrument restores solvability.
MINIMUM ACTION
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Source support: Explicit
- baike.baidu.comhttps://baike.baidu.com/item/丁伯根法则verified
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