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Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for managing utilization of distribution parameters are disclosed. In one aspect, a method includes a restrictive distribution parameter that is different from any distribution parameters in a first set of distribution parameters. An acceptable peak bid for a second set of distribution parameters that includes the restrictive distribution parameter is determined based on a first bid for the first set of distribution parameters. A determination is made that a second bid received from the content item provider does not exceed the acceptable peak bid, and the second bid is associated with the second set of distribution parameters based on the determination.