 Egalitarian considerations that address relative differences between people can help specify the standard in at least two ways. First, presently existing people may be thought to harm future people by causing them to realize a (much) lower level of well-being than their own contemporaries (Sher 1979: 389). In addition or alternatively, we might hold that the threshold level ought to reflect, say, the average level of well-being of the present generations upon whose decisions the well-being of future people depend. According to such an interpretation presently existing people harm future people by causing them to realize a (much) lower level of well-being than they enjoy themselves (see, for example, Barry 1999).