Abstract: A method, apparatus, system, and signal-bearing medium that, in an embodiment, adjust a billing rate for the use of a resource by processes based on usage data that indicates the demand for the resource either by one of the processes or by an aggregation of the processes. In an embodiment, the resource has a resource threshold, a resource billing rate, and a billing rate increment, and the aggregation of the processes has an associated system threshold and a system billing rate. In an embodiment the billing rate is incremented by the billing rate increment if an amount of use by one process exceeds the resource threshold and the number of processes exceeds a threshold. In an embodiment, if the aggregation of the processes uses the resource more than the system threshold, then the resource billing rate is set to be the system billing rate. In this way, the demand for resources may be accounted for in billing for resource use.