Full Idea
It may be that two orders or classes of good things are not commensurable, though they are comparable, with those in the other.
Clarification
'Commensurable' means able to compare by measurement
Gist of Idea
Two goods may be comparable, although they are not commensurable
Source
W. David Ross (The Right and the Good [1930], §VI)
Book Reference
Ross,W.David: 'The Right and the Good' [OUP 1930], p.154
A Reaction
This refers to moral issues, but seems helpful when faced with Kuhn's claim that Newton and Einstein are 'incommensurable'. We could hardly prefer one theory to another if we couldn't compare them.