In the Neolithic Age because there were certain people who farmed the other people could specialize in certain jobs. The farmers would make enough food for everyone so people could do other jobs rather than always just getting food like in the Paleolithic Age.
We can also trade. I give her food and she gives me clothes.
Because he farms I can weave beautiful clothing.
Some of the many jobs that were practiced were weavers, basket makers, tool makers, traders, and farmers. Allowing people to dedicate all of their time to something made them very good at it. For example, farmers knew how to grow more than 14 kinds of food plants.
I will trade you this basket for your pot.
Do you like my pot?
Because they lived in cities if they needed something then they could find someone that specialized in that certain skill and you could get an excellent product.