Contract Enforceability and Economic Institutions in Early Trade: The Maghribi Traders’ Coalition
📜 Abstract
This paper presents an economic institution which enabled 11th-century traders to benefit from employing overseas agents despite the commitment problem inherent in these relations. Agency relations were governed by a coalition—an economic institution in which expectations, implicit contractual relations, and a specific information-transmission mechanism supported the operation of a reputation mechanism. Historical records and a simple game-theoretical model are used to examine this institution. The study highlights the interaction between social and economic institutions, the determinants of business practices, the nature of the merchants’ law, and the interrelations between market and nonmarket institutions. (JEL N75, D23, J41)
✨ Summary
Summary
Avner Greif analyzes how eleventh-century Maghribi traders sustained overseas agency relationships despite weak formal contract enforcement. Combining Cairo Geniza records with a repeated-game model, the paper argues that a coalition of traders used shared information, expectations of future employment, implicit contractual norms, and coordinated punishment to make reputation-based enforcement credible. The analysis also explains how the coalition’s organization affected wages, hiring, business-association forms, accounting practices, and the use of the Merchants’ Law. The paper further argues that the institution was historically path-dependent: migration, social identity, information networks, and long-distance trade jointly shaped its emergence and persistence.
The paper became an influential reference point in research on informal institutions, reputation, community enforcement, and the institutional foundations of trade. It has been incorporated into later surveys and teaching frameworks on economic history and game theory, and subsequent studies have used it as a benchmark for analyzing non-state enforcement mechanisms. (sciencedirect.com) Later historical scholarship directly reexamined Greif’s interpretation, arguing that the Maghribi traders did use formal legal mechanisms and that their trusted business networks were less exclusive and less clearly bounded than the coalition hypothesis proposed. (onlinelibrary.wiley.com) The paper therefore functions both as a foundational model of reputation-based community enforcement and as a central case in later debates over the empirical interpretation of medieval commercial institutions. Its bibliographic influence is substantial, with citation-index data reporting more than 1,500 indexed citations, though that figure comes from a secondary citation database rather than the paper’s publisher. (rankless.org)