  Technically, Scanlon does not present a complete attention-based theory of desire, but only an attention-based sufficient condition for the existence of a desire. Perhaps this is because Scanlon sees his theory as best suited to characterizing desires that are playing an active role at the moment—occurrent desires—but not as giving a good characterization of desires not having that role—standing desires (see below). A theory of standing desires that follows Scanlon's lead might look something like the following.