Answer: Motivational decrease
Explanation: The study by Ingham and colleagues(1974) using rope pulling highlights that sometimes productivity is lesser when members work in a group than when the individual performances of those members are combined. That is the actual performance or input to the course is less than the potential performance exhibited by the members of the group. This is called social loafing in social psychology, when a individual puts in limited effort when working as part of a team than when working alone.