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To the traditional division between public and private goods, the commons add a new dimension: that of resources, material or not, that we can share and that are vulnerable to unregulated private appropriation. It is suggested that this category is key to addressing the ecological polycrisis but requires the establishment of a new type of hybrid international institutions bringing together private, public, and NGO actors, of which the Drugs for Neglected Disease initiative (DNDi) offers a promising example.