The text suggests that comparing the unit contribution margin of a sports car with an entry-level vehicle is like comparing apples and oranges, but that comparing the contribution margin ratios is a...

The text suggests that comparing the unit contribution margin of a sports car with an entry-level vehicle is like comparing apples and oranges, but that comparing the contribution margin ratios is a fair comparison. Do you agree? Why? Can you think of an example where it may be more appropriate to compare unit contribution margins but not contribution margin ratios?