Bhagavad Gita and Philosophy of Work

What is the relevance of the Gita to the young and middle aged working people in modern times?
All that Krishna says to Arjuna is: Be efficient at work. How to be efficient at work is what the Gita is all about for it is the science of action. So the workplace is where it is most relevant.
While Western management thought too often deals with problems at material, external and peripheral levels, the Gita tackles the issues from the grass roots level of human thinking.
The Bhagavad Gita is unique in its stress on work ethics as it deals primarily with man at work.