 According to the second conception, values are incommensurable if and only if there is no true general overall ranking of the realization of one value against the realization of the other value. David Wiggins, for example, puts this forward as one conception of value incommensurability. He writes that two values are incommensurable if “there is no general way in which A and B trade off in the whole range of situations of choice and comparison in which they figure” (1997, 59).