Getting promoted is the most powerful drive to work. To be honest, the main purpose of doing jobs is to earn money for life. For most people, getting promoted means a pay raise, which enables them to live a better life.
When you are promoted to a high level in the company, you will have more power in making decisions in your job. Getting a promotion also means that you will gain more respect and attention from the whole society. Taking all these into consideration(考虑), getting promoted is the most powerful drive for people to work hard.
A sense of fulfillment is the most inportant drive to work.
As a young man , finding a sense of fulfillment in his career life is the most important thing. Everyone wants to make his life meaningful. Work becomes an effective way for ordinary people to achieve their goals, which could put a sense of fulfillment into their life.
I think the biggest drive for people to work hard is that his effort can be valued and respected by other people. Without recognition(认可), one will feel his work is nothing important and then lose his enthusiasm for hard working. In this sense, to realize one's personal value is the most important, not the salary.