Why ave many storefronts in Moscow empty, while street kiosks in front are full of goods? In this Article, Professor Heller develops a theory of anticommons property to help explain the puzzle of empty storefronts and full kiosks. Anticommons property can be understood as the mirror image of commons property BY definition, in a commons, multiple owners are each endowed with the privilege to use a given resource, and no one has the right to exclude another. When too many owners hold such privileges of use, the resource is prone to overuse - a tragedy of the commons. Depleted fisheries and overgrazed fields are canonical examples of this familiar tragedy. In an anticommons, according to th-is Article, multiple owners ave each endowed with the right to exclude others from a scarce resource, and no one has an effective privilege of use. When too many owners hold such rights of exclusion, the resource is prone to underuse - a tragedy of the anticommons. Empty Moscow storefronts ave a canonical example of the tragedy of underuse. Anticommons property may appear whenever governments define new property rights in both post-socialist and-developed market economies. Once an anticommons emerges, collecting rights into usable private property bundles can be brutal and slow. The difficulties of overcoming a tragedy of the anticommons suggest that policymakers should pay move attention to the content of property bundles, rather than focusing just on the clairty of rights.