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Markowitz in the open fields
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).
Claim (verbatim)
Markowitz in the open fields. Markowitz's portfolio theory says diversification pays exactly when the assets you spread across are weakly correlated — variance falls fastest where covariance is low. The medieval open-field system's scattered strips, a puzzle ever since they were read as peasant insurance, are a portfolio: a family's holdings spread across many micro-zones of soil, drainage and frost exposure. If scattering was risk management, its intensity should track the local yield covariance matrix — recoverable today from modern soil data, since the underlying physical zones have not moved. The conjecture: villages whose micro-zones have low yield covariance scattered more, while villages on highly covariant land — where scattering bought no variance reduction — consolidated early. Enclosure history, in other words, was written in the off-diagonal terms.
Prediction clause (verbatim)
For each village in a field-system GIS with mapped strip patterns and consolidation dates, estimate the inter-zone yield covariance matrix from modern soil-survey data and compute a scattering index (strips per holding, spatial dispersion of holdings). Primary clause: across villages, mean inter-zone yield covariance correlates negatively with the scattering index at |r| >= 0.3, and villages in the top covariance quartile show earlier median consolidation than those in the bottom quartile. The verdict follows the primary clause.
Kill-dataset (verbatim)
field-system GIS vs soil covariance.
On Inferpedia
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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
already answered in the literature
Substantially published and famously so: McCloskey explicitly models open-field strip scattering in portfolio/variance-reduction terms with a measured (~10%) yield penalty, and a whole subsequent literature tests and critiques the risk-insurance explanation (pooling/storage alternatives, cost arguments). The harvest's refinement — operationalizing against a modern soil-covariance GIS matched to field maps — was not located, but the connection is a classic of the field.
- McCloskey, 'The open fields of England: rent, risk, and the rate of interest' — The portfolio model of scattering
- 'Scattering as insurance: A robust explanation of open fields?' — The critical literature
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