Avner Greif's paper examines the economic institution of the Maghribi traders' coalition, which enabled 11th-century traders to overcome the commitment problem in their agency relationships with overseas agents. The coalition, based on expectations, implicit contracts, and an information-transmission mechanism, supported a reputation system that allowed merchants to trust agents. Historical records and a game-theoretical model are used to analyze this institution, highlighting the interaction between social and economic institutions, the nature of merchants' law, and the interrelations between market and nonmarket institutions. The Maghribi traders, primarily Jewish merchants from North Africa, operated in the Mediterranean and used a coalition to manage their trade. This coalition allowed them to overcome the commitment problem by creating a reputation mechanism that ensured agents acted honestly. The coalition also provided entry and exit barriers, ensuring the sustainability of the institution. The paper discusses the challenges of agency relations, particularly the risk of agents embezzling funds. Without a supporting institution, merchants would not hire agents, as agents could act opportunistically. The Maghribi traders' coalition addressed this by creating a system of collective punishment and reputation, which encouraged honest behavior. The coalition was based on the idea that merchants would condition future employment on past conduct and punish agents who cheated. This system of collective punishment was effective because it created a self-enforcing mechanism that ensured agents acted honestly. The coalition also allowed merchants to monitor agents, reducing the risk of cheating. The paper also discusses the efficiency of the coalition in enabling trade. The coalition allowed merchants to reduce the cost of trade by better allocating risk through diversification, benefiting from agents' expertise, and shifting trade activities across trade centers, goods, and time. The coalition also enabled merchants to operate as sedentary traders, saving the cost and risk of sea journeys. The study concludes that the Maghribi traders' coalition was a successful economic institution that enabled efficient trade despite the commitment problem. The coalition's reputation mechanism and collective punishment system ensured that agents acted honestly, allowing for efficient cooperation between merchants and their overseas agents. The coalition's effectiveness is supported by historical records and a game-theoretical model that captures the essence of the problem. The study highlights the importance of institutions in facilitating economic growth and the role of reputation in ensuring cooperation.Avner Greif's paper examines the economic institution of the Maghribi traders' coalition, which enabled 11th-century traders to overcome the commitment problem in their agency relationships with overseas agents. The coalition, based on expectations, implicit contracts, and an information-transmission mechanism, supported a reputation system that allowed merchants to trust agents. Historical records and a game-theoretical model are used to analyze this institution, highlighting the interaction between social and economic institutions, the nature of merchants' law, and the interrelations between market and nonmarket institutions. The Maghribi traders, primarily Jewish merchants from North Africa, operated in the Mediterranean and used a coalition to manage their trade. This coalition allowed them to overcome the commitment problem by creating a reputation mechanism that ensured agents acted honestly. The coalition also provided entry and exit barriers, ensuring the sustainability of the institution. The paper discusses the challenges of agency relations, particularly the risk of agents embezzling funds. Without a supporting institution, merchants would not hire agents, as agents could act opportunistically. The Maghribi traders' coalition addressed this by creating a system of collective punishment and reputation, which encouraged honest behavior. The coalition was based on the idea that merchants would condition future employment on past conduct and punish agents who cheated. This system of collective punishment was effective because it created a self-enforcing mechanism that ensured agents acted honestly. The coalition also allowed merchants to monitor agents, reducing the risk of cheating. The paper also discusses the efficiency of the coalition in enabling trade. The coalition allowed merchants to reduce the cost of trade by better allocating risk through diversification, benefiting from agents' expertise, and shifting trade activities across trade centers, goods, and time. The coalition also enabled merchants to operate as sedentary traders, saving the cost and risk of sea journeys. The study concludes that the Maghribi traders' coalition was a successful economic institution that enabled efficient trade despite the commitment problem. The coalition's reputation mechanism and collective punishment system ensured that agents acted honestly, allowing for efficient cooperation between merchants and their overseas agents. The coalition's effectiveness is supported by historical records and a game-theoretical model that captures the essence of the problem. The study highlights the importance of institutions in facilitating economic growth and the role of reputation in ensuring cooperation.