n a recent article (Coursey 1985), I considered consumer behavior in a model in which preferences are described by an activity hierarchy. Using this activity hierarchy description, consumers were found to sequentially satisfy higher ranked activities in their preference ordering up to the point that their monetary and time resources were exhausted. Among the more interesting implications of this behavior were that (1) if a consumer's economic resources are subsequently increased, then additional consumption will commence at the point where the consumer's resources were initially exhausted, (2) a change in the price of a commodity used in an activity will have a pure substitution effect in the production of that activity and a spillover income effect at the point of resource exhaustion, and (3) comparative statics effects of any change are unidirectional and will affect behavior only from the point where the effects enter the consumer's sphere forward to the point of exhaustion of economic resources. The results were derived under the assumption that each commodity can be used in the production of only one activity. In their follow-up article, Brooks and Earl (1987) relaxed this assumption and considered the implications of jointness in consumption in the context of the activity hierarchy model. In their extension, a commodity may be used as a perfect substitute at different places in the activity hierarchy. They concluded that my general results become less clear when commodities can be used in this fashion. I fully concur with their motive for this extension' and welcome their remarks as a further contribution to the field of choice regarding priorities.2 In this brief article, I wish to outline fully how their results should be interpreted. One interpretation involves the theoretical relationship between the activity hierarchy model and the more traditional (to economists) utility maximization model. The second interpretation involves the use of the activity hierarchy model and its extensions for empirical analysis.