Suppose a consumer'* preferences are monotonic. What can you say about her preference ranking over the bundles (10, 10), (10,9) and (9, 9)?
If a consumer has monotonic preferences then :
(i) Bundle (10, 10) is monotonically preferred to bundle (10, 9) and bundle (9, 9).
(ii) Bundle (10, 9) is monotonically preferred to bundle (9,9).