Trade protects the laberor, because he/she can inspect him/her-self what he/she gets in return, and choose to agree or disagree to the sale. This also distributes power into all hands.

Example: I fabricate an axe, and i exchange that for one fish every week from a fisherman for one season.

Example 2: buying trunks in the shop (talking about something very basic and simple and known here, this is done all over the world already, and has been done for thousands and thousands of years).