What is the prime function of the leader in a team?

Motivate the sales team to achieve the sales figures

The prime function of team leader is to achieve the tasks in time with maximum efficiency of his team according to the standards with available resources.

I see a leader defined as follows; (1) A leader must have a vision to drive.
This is the prime requirement.
(2) manage by example (3) knowledgeable and qualified (4) respect members (5) maintains credibility all the time (6) Absorb failures to him/her self and distribute success among the team (7) Un-bias (8) Very organised (9) Loves innovation, change and continuous improvement (10) Excellent communicator