Why was the growth of trade important?

It was important because with out the growth of trade people couldn't have survived without the stuff they were low on and had no other way to get it. 

During the paleolithic, hominins grouped together in small societies such as bands, and subsisted by gathering  plants  and fishing, hunting or scavenging wild  animals. the paleolithic is characterized by the use of knapped stone tools, although at the time humans also used  wood  and bone tools.