There was a salt merchant who used a donkey to transport salt bags. On their way they had to cross a stream of water slightly less than knee deep.
Accidentally the donkey fell one day in the waters and to its surprise it noticed reduction in its load and hence forth it made it a practice to do it daily.
Merchant was helpless as he was losing some salt in the transport resulting in loss. He decided to teach the donkey a lesson and one day loaded it bags of cotton instead of salt.
The donkey was thrilled as the initial load itself was very light, nevertheless greed was part of now intelligent donkey and it dipped in water as usual …………….. and somehow it made it home.
Moral of the story , assume all are smart in this world !