The statement that individual utilities or productivities are interdependent is equivalent to saying that some resource which is commonly used is not centrally owned. But from this it does not follow that a change in ownership alone is always sufficient to produce the necessary conditions for attaining a Paretian utility frontier. . . . In many cases it is impossible to secure the centralization of ownership required to make the external diseconomies of usage internal to a single owner without
at the same time providing the single owner with a degree of monopoly control over the total supply of resource services.
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