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Rights-markets are the latest mechanisms invented for two centuries to adapt market and property patterns to a plural reality or to plural logics. The diversity of their application renders them unavoidable in the domains of environmental management and economic analysis. And yet Law as such is strikingly absent from such developments though markets deal with « rights », which therefore raises issues of definition and application. The relationships between rights and the market are more complex and delicate to interpret than is often imagined. There may hence be a need to re-launch the dialogue between economics and law, by way of legal anthropology.