AI-generated conjecture · below the evidence/publication boundary

Double marginalization on the Rhine

Status: Prior

Status is derived only from the shepherd-authored triage/prediction data above -- community submissions and claims are a separate overlay and can never change it (see the participation panel below).

This is a proposed connection between two domains, generated by a language model. It is not an article and not evidence: it sits below the evidence/publication boundary. A quantitative prediction and a named kill-dataset are attached (when registered) so the claim stays falsifiable rather than merely evocative.

Claim (verbatim)

Double marginalization on the Rhine. Vertical-monopoly pricing from industrial organization meets the toll castles of the Holy Roman Empire: a chain of independent tolls on one river overcharges relative to a single owner, so consolidation of adjacent tolls under one prince should cut the combined rate and fragmentation should raise it — a running natural experiment, 1250-1450.

Prediction clause (verbatim)

Stretches where two or more adjacent tolls came under a single lord show combined toll burdens falling 15-40% within 20 years of consolidation; stretches gaining a new independent toll show the total burden rising by at least the new toll's full rate with no offsetting cuts; and traffic diversion to Mosel or overland routes has elasticity <= -0.5 with respect to the number of active tolls.

Kill-dataset (verbatim)

Kill: the Rhine toll accounts of Koblenz, Ehrenfels, and Kaub together with toll-grant records in the Regesta Imperii.

Provenance

Run: Fresh agent generation · model: claude-fable-5

Generated by a fresh Fable-tier instance at maximum effort with generation-first blindness (no repo/web/DB access); titles-only knowledge of existing items, embedded in titles_supplied per the batch-2 lane rule; prompt pre-committed in docs/GOAL_CONJECTURES_BATCH3_20260705.md (b043140). Novelty unverified by construction. titles_supplied stripped to the committed sidecar conjecture_fresh_fablemax_batch3_titles_supplied_20260705.md at import (schema additionalProperties:false; relaxation queued).

Novelty / leakage triage

Leaked (already exists in the literature)

A direct, named prior exists on the exact episode: Gardner's 'Tolling the Rhine in 1254: Complementary Monopoly Revisited' formally analyzes the medieval Rhine toll network through complementary-monopoly theory — double marginalization under its other name — including the station-count problem and the 1254 League's suppression of unauthorized tolls. The conjecture's before/after consolidation regressions and diversion elasticities were not located, but the join is published on the same case.

Gardner, 'Tolling the Rhine in 1254: Complementary Monopoly Revisited' — The exact join on the exact episode

Predictions

No prediction registered yet.

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