1. A method of managing cloud consumption periods, comprising: accessing a set of aggregate usage history data for a set of users each operating a set of machines consuming a set of resources in at least one host cloud; generating a set of variable consumption periods over which the consumption of the set of resources will be tracked for the set of users on a combined basis; identifying a set of subscription margins for at least one resource in the set of resources based on a comparison of the consumption of the at least one resource to a resource subscription limit for the set of users on a combined basis over the set of variable consumption periods; generating a set of marginal consumption values for the set of users for at least one resource for the set of variable consumption periods in the at least one host cloud; and generating at least one management action based on the marginal consumption value for the set of variable consumption periods.