 The single threshold view by itself does not provide us with a response to this objection. For a plausible substantive specification of a threshold notion (see  §4.3  below) will not include a concern for the well-being of those above the threshold. Thus, in responding to the objection we would have to add an additional obligation. For example, we could appeal to the additional obligation of minimizing harm to other persons: The obligation requires that we not cause another person to fall to a lower level of well-being quite independently of the level of well-being the person already realizes. What counts as a lower level of well-being can be measured by the specified threshold.