Why did the Olmec want to create a trade system?

The social contact theory states that

Around the third week of a college class, a professor decides she’s had enough, is tired of dealing with bureaucracies, and wants out. so one day, instead of coming to class, she flies to tahiti and sells souvenirs on the beach. if this happened, the college would simply assign a substitute to finish the course. what does this tell you about the nature of the authority wielded by a professor?

The following force measurements were taken during actual testing of the lever pictured. what is the ama of this lever?