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 "doc_id": "jof_12902",
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 "annotated_at": "2026-11-03T23:14:15+00:00",
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 "annotation": {
  "genre": "empirical",
  "subfield": "financial_intermediation_banking",
  "subfield_secondary": "economic history / derivatives market structure",
  "primary_method": "difference_in_differences",
  "identification": {
   "estimand": "Causal effect of introducing central clearing (CLAM, 1882) on the share of coffee trade flows passing through Le Havre, relative to other harbors and control commodities",
   "strategy": "Triple difference-in-differences across harbor, commodity (coffee vs. non-cleared colonial commodities) and time around the 1882 CCP creation, extended to Europe-level import shares. Mechanism is inspected with trader-level data and narrative evidence.",
   "key_assumptions": [
    "Parallel trends in trade shares between Le Havre coffee and control harbors/commodities absent the CCP",
    "Timing of CLAM creation was not driven by anticipated trade-flow changes",
    "Control commodities are unaffected by central clearing"
   ],
   "threats_addressed": [
    "Pre-trends in Le Havre trade flows",
    "Anticipation by traders, argued against through the contemporaneous debate",
    "Alternative mechanisms, discussed in a dedicated subsection",
    "Generalizability, checked with other commodities"
   ],
   "causal_language_strength": 4,
   "uses_causal_claim": true
  },
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    "sentence_index": 0
   },
   "gap": {
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   },
   "method": {
    "present": true,
    "sentence_index": 2
   },
   "results": {
    "present": true,
    "sentence_index": 2
   },
   "magnitude": {
    "present": false,
    "sentence_index": -1
   },
   "contribution": {
    "present": false,
    "sentence_index": -1
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  "introduction": {
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    },
    {
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     "move": "contribution_statement"
    },
    {
     "paragraph_index": 1,
     "move": "identification_defense"
    },
    {
     "paragraph_index": 2,
     "move": "contribution_statement"
    },
    {
     "paragraph_index": 2,
     "move": "mechanism_or_theory_sketch"
    },
    {
     "paragraph_index": 3,
     "move": "preview_of_results"
    },
    {
     "paragraph_index": 4,
     "move": "preview_of_results"
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   ],
   "contribution_paragraph_index": 1,
   "contribution_types": [
    "new_evidence",
    "new_data_or_measure",
    "new_identification"
   ],
   "roadmap_present": false,
   "literature_positioning_location": "inside_introduction"
  },
  "section_roles": [
   {
    "idx": 0,
    "role": "introduction"
   },
   {
    "idx": 1,
    "role": "theory"
   },
   {
    "idx": 2,
    "role": "data"
   },
   {
    "idx": 3,
    "role": "results"
   },
   {
    "idx": 4,
    "role": "results"
   },
   {
    "idx": 5,
    "role": "conclusion"
   }
  ],
  "results_presentation": {
   "economic_significance_discussed": true,
   "statistical_significance_language": "unclear",
   "magnitude_statements_in_intro": true
  },
  "robustness": {
   "location": "within_results",
   "types": [
    "alternative_measure",
    "other"
   ]
  },
  "tables": {
   "convention_notes": "Notes cite the estimating equation number, the sample (e.g., 23 French harbors or country-level samples) and the dependent variable for each column. Descriptive share tables average over the pre-event window 1877–1882. The trader pool table uses two-sample pre/post t-tests.",
   "units_stated_in_notes": true,
   "standard_errors_description": "unclear"
  },
  "figures": {
   "uncertainty_shown": "unclear"
  },
  "conclusion": {
   "bounded_claims": true,
   "policy_implications": true,
   "open_questions": true,
   "restates_contribution": true
  },
  "hedging": {
   "level": "moderate",
   "typical_devices": [
    "'arguably' for the exogeneity claim",
    "'consistent with' framing for mechanism evidence",
    "explicit caveats on external validity to modern mandatory clearing"
   ]
  },
  "claim_evidence": [
   {
    "claim": "Central clearing shifted French trade flows in coffee toward Le Havre",
    "evidence_type": "table",
    "evidence_ref": "Table II, Figure 1"
   },
   {
    "claim": "The effect extends to Europe-wide import shares from France",
    "evidence_type": "table",
    "evidence_ref": "Table V, Figure 2"
   },
   {
    "claim": "Futures volume rose sharply after CLAM creation while the low-quality trader share stayed low, indicating a missing market",
    "evidence_type": "descriptive_statistic",
    "evidence_ref": "Figure 6, Table VII"
   },
   {
    "claim": "New trader share and entry rose and turnover fell after clearing, consistent with mitigated adverse selection",
    "evidence_type": "figure",
    "evidence_ref": "Figures 5 and 7, Table VII"
   },
   {
    "claim": "Results also hold for other commodities",
    "evidence_type": "table",
    "evidence_ref": "Table III"
   }
  ],
  "structural_summary": "The introduction frames contracting innovations as remedies for financial frictions and notes that identifying them is hard. It then presents the 1882 Le Havre CCP as a natural experiment and states two contributions: a causal effect on trade flows and a mechanism. A short theory section yields the hypothesis, followed by historical background and data. The main results use triple-DiD at the French and European levels, supplemented by narrative and consumption evidence. A long mechanism section separates missing-market and adverse-selection channels and alternatives. The conclusion caveats lessons for modern mandatory clearing.",
  "writing_profile_keywords": [
   "economic history",
   "natural experiment",
   "triple difference-in-differences",
   "hand-collected archival data",
   "mechanism decomposition",
   "derivatives clearing",
   "single-author first person"
  ],
  "confidence": 0.8,
  "notes": "The role_rule labels for sections 2 (literature) and 4 (robustness) were overridden: the excerpts show these sections are background/data and mechanism results. Standard error type and significance notation are not visible in the excerpts. Quantitative statements in the introduction include the 8.2% low-quality trader share and the 303% rise in futures volume."
 },
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  "contribution_regex_in_intro": true,
  "magnitude_in_abstract": false,
  "abstract_n_sentences": 6,
  "intro_n_paragraphs": 5,
  "intro_n_words": 918,
  "causal_words_in_abstract": 0,
  "hedge_words_in_abstract": 0,
  "stars_mentioned": false,
  "clustered_se_mentioned": false,
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