Theory 07/History & Historical Dynamics/Historical dynamics
States Fail at an Elasticity
Collapse is narrated as a shock. The vulnerability was fiscal, and the shock only chose the date.
State collapse follows the point where the marginal cost of extracting revenue exceeds the marginal revenue, so external shocks trigger collapse but do not determine its timing.
01The evidence
States have collapsed after shocks that similar states survived, and the difference often lies in fiscal structure rather than in the shock's magnitude.
02The tension
Narratives emphasise invasion, climate or plague. Those are real triggers, and they do not explain why comparable shocks were survived elsewhere.
03The mechanism
A state extracts revenue from a tax base that resists extraction. Beyond a point, each additional unit costs more to collect than it yields: evasion, coercion and unrest rise faster than receipts.
That makes collapse an elasticity problem. The state becomes fragile when the elasticity passes one, and any shock then triggers failure; before that point, the same shock is survivable.
04What this is not
Those make the shock the cause. This makes fiscal elasticity the cause and the shock the timing.
05Predictions
- P1Collapse should follow elasticity crossing one.
- P2Comparable shocks should be survived by states below the threshold.
- P3Revenue per unit cost should fall before collapse.
06Refutation
Collapse timing tracking shock magnitude at controlled elasticity would favour the shock account.
07What it changes
It would make fiscal structure a predictor of state fragility.