Being replaceable
Being replaceable is not a yes or no question. Understand the factors influencing how replaceable you are. These are your relationship with your boss and his/her actual strength, the number of „knots” in your personal network, and the competitive context. Appreciate that security of your employment is mostly in the hand of your immediate supervisor. Nurture mutually beneficial relationship with her/him, always give more than you expect to receive. Have an extensive network, never be shy asking favors in need. Ultimately, just run faster than the guy next to you.