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cross-maturity and cross-country comparisons",29 "key_assumptions": [30 "Stock returns affect funding status but are unrelated to swap spreads except through underfunding",31 "Controls capture other known swap spread drivers"32 ],33 "threats_addressed": [34 "Yield curve level jointly driving swap spreads and underfunding",35 "Omitted variables such as sovereign credit risk and corporate issuance",36 "Time-period dependence",37 "Measurement of underfunding"38 ],39 "causal_language_strength": 3,40 "uses_causal_claim": true41 },42 "abstract_moves": {43 "question": {44 "present": true,45 "sentence_index": 046 },47 "gap": {48 "present": true,49 "sentence_index": 150 },51 "method": {52 "present": true,53 "sentence_index": 254 },55 "results": {56 "present": true,57 "sentence_index": 458 },59 "magnitude": {60 "present": false,61 "sentence_index": -162 },63 "contribution": {64 "present": true,65 "sentence_index": 166 }67 },68 "introduction": {69 "moves": [70 {71 "paragraph_index": 0,72 "move": "motivation"73 },74 {75 "paragraph_index": 0,76 "move": "preview_of_approach"77 },78 {79 "paragraph_index": 1,80 "move": "tension_or_puzzle"81 },82 {83 "paragraph_index": 1,84 "move": "mechanism_or_theory_sketch"85 },86 {87 "paragraph_index": 2,88 "move": "identification_defense"89 },90 {91 "paragraph_index": 2,92 "move": "robustness_mention"93 },94 {95 "paragraph_index": 3,96 "move": "preview_of_results"97 },98 {99 "paragraph_index": 4,100 "move": "related_literature_positioning"101 },102 {103 "paragraph_index": 5,104 "move": "related_literature_positioning"105 },106 {107 "paragraph_index": 5,108 "move": "contribution_statement"109 },110 {111 "paragraph_index": 6,112 "move": "roadmap"113 }114 ],115 "contribution_paragraph_index": 5,116 "contribution_types": [117 "new_evidence",118 "new_data_or_measure",119 "new_theory_or_model",120 "resolution_of_puzzle"121 ],122 "roadmap_present": true,123 "literature_positioning_location": "inside_introduction"124 },125 "section_roles": [126 {127 "idx": 0,128 "role": "introduction"129 },130 {131 "idx": 1,132 "role": "results"133 },134 {135 "idx": 2,136 "role": "other"137 },138 {139 "idx": 3,140 "role": "theory"141 },142 {143 "idx": 4,144 "role": "results"145 },146 {147 "idx": 5,148 "role": "results"149 },150 {151 "idx": 6,152 "role": "conclusion"153 },154 {155 "idx": 7,156 "role": "appendix"157 },158 {159 "idx": 8,160 "role": "appendix"161 }162 ],163 "results_presentation": {164 "economic_significance_discussed": false,165 "statistical_significance_language": "unclear",166 "magnitude_statements_in_intro": false167 },168 "robustness": {169 "location": "main_text_section",170 "types": [171 "alternative_specification",172 "alternative_measure",173 "alternative_sample_period",174 "subsample",175 "falsification"176 ]177 },178 "tables": {179 "convention_notes": "Table notes define variables in quarterly changes, reference equations for constructed measures, and describe panels and model columns; one illustrative cash-flow table and one balance sheet table with stated units.",180 "units_stated_in_notes": true,181 "standard_errors_description": "unclear"182 },183 "figures": {184 "uncertainty_shown": "no"185 },186 "conclusion": {187 "bounded_claims": true,188 "policy_implications": false,189 "open_questions": false,190 "restates_contribution": true191 },192 "hedging": {193 "level": "moderate",194 "typical_devices": [195 "possible reasons",196 "can drive",197 "helps explain",198 "support the view",199 "fairly consistent"200 ]201 },202 "claim_evidence": [203 {204 "claim": "30-year U.S. swap spread turned negative after Lehman default and stayed negative",205 "evidence_type": "figure",206 "evidence_ref": "Figure 1"207 },208 {209 "claim": "Underfunded pension plans optimally receive fixed in long-dated swaps; dealer constraints imply negative spreads",210 "evidence_type": "equation_or_proof",211 "evidence_ref": "Section III; Appendix: Model and Proofs"212 },213 {214 "claim": "Changes in underfunding ratio explain changes in 30-year swap spreads, mainly when plans are underfunded",215 "evidence_type": "table",216 "evidence_ref": "Table IV; Figure 2"217 },218 {219 "claim": "Funding status does not explain 2- to 10-year swap spreads",220 "evidence_type": "table",221 "evidence_ref": "Table V"222 },223 {224 "claim": "Results hold in 2SLS using stock returns as instrument",225 "evidence_type": "table",226 "evidence_ref": "Table VI"227 },228 {229 "claim": "Link robust to extra controls, period dummies and alternative measure; strongest right after Lehman",230 "evidence_type": "table",231 "evidence_ref": "Table VII"232 },233 {234 "claim": "Similar underfunding-swap spread link in Japan and the Netherlands",235 "evidence_type": "table",236 "evidence_ref": "Tables VIII-IX"237 }238 ],239 "structural_summary": "Opens with a persistent pricing anomaly that contradicts the prior credit-risk and convenience-yield view of swap spreads, then proposes a demand-plus-frictions hypothesis. Stylized facts come first, followed by institutional background on pension duration needs and swap supply. An illustrative model, with proofs in the appendix, formalizes the mechanism. U.S. time-series regressions follow, covering regimes, OLS, 2SLS and robustness checks, with a maturity-based falsification. International extensions to Japan and the Netherlands come next, and a brief conclusion restates the contribution.",240 "writing_profile_keywords": [241 "anomaly-driven",242 "demand-based explanation",243 "limits to arbitrage",244 "illustrative model",245 "instrumental variables",246 "cross-country extension",247 "institutional detail"248 ],249 "confidence": 0.8,250 "notes": "Standard error type and significance notation not visible in table notes excerpts. 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