AI-generated conjecture · below the evidence/publication boundary

Millstone gravity

Iron Age & Antiquity Rome & Italy Europe

Status: Anticipated · untested

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)

Millstone gravity. The gravity model of trade — flows decay with distance, and how steeply they decay depends on what the goods are worth relative to what they cost to move — is here tested on sourced ancient artifacts. Provenance science can trace both Mayen lava millstones and fine pottery back to their production sites, yielding clean distance-decay curves for two goods at opposite ends of the value-density spectrum: millstones are heavy and cheap per kilogram, fine wares light and valuable. The conjecture is quantitative, not merely directional: distance-decay exponents should scale with value density, so Mayen millstones should decay steeper than fine pottery by precisely the ratio of transport cost to unit value — not just by more. If the exponents fit that ratio, ancient distribution obeyed the same freight economics as modern trade.

Prediction clause (verbatim)

For each sourced find of Mayen lava millstones and of the comparison fine pottery in the distribution maps, record distance from production source, and fit distance-decay exponents to the two falloff curves. Independently estimate the transport-cost-to-unit-value ratios of the two goods from their weights and attested values. Primary clause: the millstone exponent exceeds the pottery exponent, and the ratio of the two exponents matches the ratio of transport cost to unit value within a factor of two; a shallower millstone decay, or exponent ratios wildly off the cost ratio, kills the conjecture. The verdict follows the primary clause.

Kill-dataset (verbatim)

sourced distribution maps.

Nobody has run this test. The kill-data is named above. If you can run it — or you know the paper that already settles it — claim the kill or submit the prior. Kills and priors are credited here, by name, as they come in.

In the atlas

This conjecture is bridged, as an L1 lead, onto these Inferpedia subject pages.

Provenance

Run: Imported conversation (verbatim harvest) · model: claude-fable-5

Origin: operator conversation with Claude Fable 5 at max effort, conducted 2026-07-03, relayed verbatim by the operator into the shepherd session on 2026-07-04. No ModelRun exists for the original generation (it happened outside the pipeline); this transcript file is the canonical capture. Transcript path: docs/generated/conjecture_harvest_fablemax_20260703.md. Model (operator-attested, not pipeline-recorded): claude-fable-5. Novelty disclaimer (verbatim, load-bearing -- rule 4): "Same caveat as before, doubled: at 100 items across all of archaeology and history, some of these will have cousins in the literature I can't check. What I can guarantee is the format — each links two things not normally linked, and each names the dataset or measurement that would kill it."

Novelty / leakage triage

anticipated in the literature — this exact test has never been run

Mayen lava quernstone distributions are mapped in detail (waterway-dependence, period shifts), and a methodologically parallel study derives transport-cost ratios from pottery distance-decay in Roman Britain — the same analytic move on a different commodity. The cross-commodity test (millstone vs fine-pottery decay exponents scaling by transport-cost-to-unit-value ratio) was not located.

'The Distribution and Exchange of Mayen Lava Quernstones in Early Medieval Northwestern Europe' — The millstone distribution corpus
'The costs of transporting goods by different modes: pottery movement in late Roman Britain', JAS — Distance-decay-derived transport-cost ratios, parallel method

Predictions

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