Suppose your friend is indifferent to the bundles (5, 6) and (6, 6). Are the preferences of your friend monotonic?
No. These preferences are not monotonic. If a consumer has monotonic preferences, he would prefer the bundle (6, 6) to the bundle (5, 6) because the bundle (6, 6) has more of Good-1 as compared to the bundle (5, 6).
