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The grade ladder of charta
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).
“Anticipated in print” means the direction of this claim already appears in scholarship, while this exact test has never been run — it records prior art, not proof; nothing here counts as supported or falsified until a registered resolution says so.
Claim (verbatim)
Papyrus was sold in named quality grades cut from different parts of the same plant by one fixed process; parchment quality depended on animal, age, region, and finishing skill, all of which could diverge over time. Join the two quality ladders through their price structure: the ratio of top-grade to ordinary papyrus prices should be a constant of the industry, holding near 2:1 for centuries, while parchment's fine-to-ordinary price spread should widen across the medieval centuries as finishing specialized. A process-defined grade cannot drift; a craft-defined grade can. If this holds, it explains a familiar aesthetic asymmetry — ancient book luxury lived in script and size while medieval luxury lived in the skin itself — as a fact about how each material's price ladder was manufactured.
Prediction clause (verbatim)
Primary clause (carries the verdict): attested same-year, same-place price ratios between top-grade and ordinary charta remain within a 1.5-2.5x band across the 1st-4th centuries CE. Secondary clause: medieval fine-to-ordinary parchment price ratios reach at least 4x by the 14th century, with within-market dispersion of parchment prices exceeding that of graded charta.
Kill-dataset (verbatim)
papyri.info (in-house) price attestations for charta by named grade — non-codex evidence of the writing material as a traded commodity — with SDBM material and price notices supplying the medieval parchment comparison; the kill is a statistical dispersion test.
In the kill-dataset registry:
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 scholarship. Kills and prior scholarship are credited here, by name, as they come in.
How this item is catalogued
Catalogue tags are curatorial metadata that make the conjecture findable. They are not findings, not a novelty verdict, and naming a source family is not a promise that the data exist or are accessible. Each dimension below says whether it was assigned, reviewed with none applying, uncertain, or not yet reviewed, and who recorded it.
- Place & era tags — Assigned
- Egypt; Europe; Medieval Tagged by claude-sonnet-5 + claude-fable-5 (gate)
- Dating — Phenomenon
- Dated 1 CE – 1400 CE Claim's own explicit '1st-4th centuries CE' papyrus grade-price ratios (papyri.info) vs. medieval parchment grade spreads reaching '14th century' (SDBM). Tagged by claude-sonnet-5 + claude-fable-5 (gate)
- Subject — Assigned
- Book economics & scribal labour (from the generation section)
- Finer subject topic — Assigned
- Manuscript and scribal production Tagged by earlier curation lane (link provenance on record)
- Claim level — Assigned
- Record claim Tagged by earlier curation lane (link provenance on record)
- Method — Assigned
- Market equilibrium, price, and arbitrage Tagged by earlier curation lane (link provenance on record)
- Evidence source — Assigned
- Egyptian papyri & ostraca; Prices & wages Tagged by earlier curation lane (link provenance on record)
- Research stage — Idea — no test designed
On Inferpedia
This conjecture is linked to the following pages on Inferpedia, an encyclopedia of the missing — working atlas pages, some still early scaffolding.
Provenance
Run: Fresh agent generation · model: claude-fable-5
Composed blind from the model's own knowledge in a zero-tool session and emitted directly as final text.
Novelty / leakage triage
anticipated in the literature — this exact test has never been run
Pliny's process-defined six grades of papyrus and craft-defined parchment quality are documented, but the comparative price-ladder test—top-to-ordinary charta ratio constant near 1.5-2.5x for centuries while fine-to-ordinary parchment widens to >=4x—has not been computed.
Predictions
No prediction registered yet.
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