Had object ellipsis been involved in the emergence of all one wants as an adverbial phrase, this phrase would have played a somewhat altruistic role in the process. The phrase all one can seems to be closely related to all one wants. All one wants and all one can seem to occur in specific contexts, the general pattern of which can be construed as reflections of the meaning of these two phrases. The status of all one wants as a latecomer may be ascribed to the diachronic facts of want and other related predicates.
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