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The Sogdian Diaspora and the Informal Architecture of Trans-Eurasian Credit
粟特人离散群体与跨欧亚信用的非正式架构
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Operating without state charters or centralized banks, Sogdian merchants built a pan-Eurasian credit network spanning Samarkand to Chang’an between the fourth and eighth centuries.4至8世纪，粟特商人未依赖州级特许状或中央银行，便在撒马尔罕与长安之间构建起横跨欧亚的信用网络。
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Their letters, preserved in Turfan and Dunhuang, reveal standardized promissory formulas, multi-tiered guarantor hierarchies, and interest-rate conventions calibrated to caravan risk profiles.他们在吐鲁番和敦煌留存的书信显示，当时已采用标准化的期票格式、多层级担保人体系，以及按商队风险等级调整的利率惯例。
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Rather than relying on legal enforcement, creditworthiness was verified through kinship-anchored reputation, intermarriage alliances, and publicly recorded debt settlements at oasis markets.信用资质并非依靠法律强制执行，而是依托血缘维系的声誉、联姻联盟，以及在绿洲市场公开记录的债务清偿。
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This informal infrastructure enabled large-scale silk-for-silver transactions while minimizing reliance on imperial coinage or bureaucratic oversight.这一非正式基础设施支撑了大规模的丝绸换白银交易，同时最大限度减少了对帝国铸币及官僚监管的依赖。
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Chinese Tang officials tolerated Sogdian financial autonomy precisely because it reduced fiscal administration burdens and stabilized frontier tax yields.唐朝官员容忍粟特人的金融自治，正因其减轻了财政管理负担，并稳定了边疆税收。
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When the An Lushan Rebellion disrupted northern trade routes, Sogdian networks fragmented not into collapse but into adaptive sub-nodes across Central Asia and Persia.安史之乱扰乱北方商路后，粟特网络并未崩溃，而是分化为中亚与波斯各地灵活适应的子节点。
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Their epistolary archives show how trust was quantified: delayed payments triggered recalibrated credit ceilings, not punitive sanctions, preserving long-term reciprocity.其书信档案表明信任如何被量化：付款延迟触发的是信用额度重新核定，而非惩罚性措施，从而维系长期互惠。
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Modern remittance systems in migrant corridors replicate their logic—relying on community reputation rather than formal collateral or sovereign guarantees.当今移民汇款体系沿袭其逻辑——依赖社区声誉，而非正式抵押或主权担保。
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The Sogdians never sought political sovereignty; instead, they engineered economic sovereignty through procedural consistency across jurisdictions.粟特人从未谋求政治主权，而是通过跨辖区程序一致性，构建经济主权。
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Their dissolution came not from conquest but from the Abbasid Caliphate’s systematic absorption of their contractual templates into Islamic commercial law.其消亡并非源于征服，而是阿拔斯王朝系统性地将他们的契约范式纳入伊斯兰商法。
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This case illustrates how non-state actors can generate binding financial norms where formal institutions remain weak or contested.此案例说明，当正式制度薄弱或存争议时，非国家行为体仍可生成具有约束力的金融规范。
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It challenges the assumption that monetary trust requires centralized authority, revealing instead how dense interpersonal networks scaffold systemic resilience.它挑战了‘货币信任必赖中央权威’的假设，揭示出紧密的人际网络如何支撑系统韧性。