Making the stone soup changed the villagers because in the begining of the story, the villagers did not know happiness.Then when the monks came, they made stone soup and when the villagers smelled the soup they all brought items for the soup and came together like a family.
In the story it says, one by one, the people of the village came out to see just what this stone soup was.
Also in the story it says, something magical began to happen among the villagers. As each person opened his or her heart to give the next gave even more.
In addition the author also says, after the banquet they told stories, sang songs, and celebrated long into the night.Then they unlocked their doors and took the monks into their homes and gave them very comfortable places to sleep.
This shows that the author is telling me that the villagers had changed because they had started unlocking their doors and trusting each other.
This reminds me of when my family came together on chistmas day and gave presents to each other just like in the story, the villagers had came together and each of them gave items for the banquet.