In the Paleolithic times I think all of the jobs were important. But I think the most important one was farming or hunting, I think this because they needed food to survive and farmers and hunters get food.
In the Paleolithic Age people obtained food by Hunting and Gathering. This was bad because most hunters would come back injured or wouldn't come back at all. And with gathering some things they gathered could have been poison and if they were there for along time most foods could have diapered.
Some specialized jobs are were traders, toolmakers, weavers, farmers, basket makers, and builders.
The growth of trade was important because if we couldn't grow a crop in the place we settled but we needed it to make a medicine we wouldn't be able to get the crop. We know are smarter about different crops.
People used temporary shelters for there homes in the Paleolithic Age. These homes were temporary because hunters-gatherers needed to move around to fallow animals and find new foods.