 is a slight improvement on A1, A1+ is not better than A2. This scenario seems possible, and if it is, then we have a case of incommensurable alternatives. For, in this case, A1 is not better than A2, A2 is not better than A1, and yet A1 and A2 are not equally good. If A1 and A2 were equally good, then an improvement on A1, such as A1+, would be better than A2. But, for Kay, A1+ is not better than A2.