After thinking about this question for weeks, I have decided that teachers teach so that others may learn. Education has become a large part of the foundation of our culture, so there is a need for educators. As individuals are achieving their education, and gaining skills to be used in their chosen careers, they are making conscious choices as to how they want to earn a living. People mostly choose their jobs because they feel it is something that they can do successfully.  They are choosing to be contributing members of their society, so that the society can continue to thrive.