Income disparity, cont'd

Rob asks, "is there any disagreement among us that, from the perspective of Catholic legal theory, [the growing income disparity in the United States] is a real problem?"  I'm not sure I "disagree[]" that this is a problem, but still . . . why, exactly, is it a problem?  If we put aside -- just for the sake of discussion -- entirely appropriate concerns about, for example, a consumption culture that is fed by images of the super-rich on spending binges, or about whether those at the low end of the scale (or in the middle, or at the high end, for that matter) are being compensated justly, and just ask about "income disparity" . . . why, from a CST perspective, is this objectionable?  (Please note, I am not asserting that it is not objectionable; I'm only asking why we should so quickly conclude, or assume, that it is).

Rick