In the Paleolithic times everyone was on there own. Everyone had to catch there own food and find there own source of water. Everyone knew just enough to survive.
The second major thing that happened is that now instead of everyone doing everything, different people have different jobs. That helps people get more things done quicker. Also it makes them better at what they do.
I will go get some wood.
The first major thing that happened was that people would be in contact with other people more often. So people started coming up with better ways to do things. They started to assign jobs.
Something that was very useful when they got jobs was that everyone got good at the thing that they do. So like the hunters got very good at providing food, so that gave the people time to do other things like arts and crafts.
When the people got jobs they had people that has the same job as them so they could work together to get the job done sometimes.