Therefore, there are many theories that speak of human motivation, among them the aforementioned Pyramid of Maslow,
the three factors of Mcclelland or the theory of the dual factor of Herzberg.
In contrast, David Mcclelland believed that workers could not
be motivated by the mere need for money-- in fact, extrinsic motivation(e.g., money) could extinguish intrinsic motivation such as achievement motivation, though money could be used as an indicator of success for various motives, e.g.,