Rahn Curve
Updated 2026-08-05
INTRODUCTION
English translation pending.
CORE DEFINITION
The Rahn curve describes the relationship between the share of government spending in total output and the rate of economic growth. The shape is an inverted U: at low levels, spending on infrastructure and the rule of law supports growth, but once spending passes a threshold, often placed between fifteen and twenty-five percent, the tax burden and the inefficiency of a too-large state drag growth down. The practical reading is that government is neither better the larger nor better the smaller: there is an optimal size, and beyond it the state itself becomes an obstacle to development. Qualification: the threshold is an empirical estimate that varies by country.
SCAFFOLDING EFFECT
Reduce cognitive load
- Threshold search: locate the point at which additional spending stops paying for itself in growth. - Size argument: reject both the larger-is-better and the smaller-is-better positions as a matter of principle. - Temperature window: in physiology, find the range where oxygen consumption stays within safe limits.
Anchor fast decisions
In the physiological reading, the curve traces how an embryo's rate of oxygen consumption changes with temperature, coupling temperature to metabolic demand and to the oxygen supply available. It marks the boundary outside which development cannot be sustained, which is why incubation controls both temperature and gas exchange. The economic reading of the same name traces growth against the size of the state.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Rahn_curveverified
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