I remember Malcolm X talked about the benefits of speaking up. He said, basically, a closed mouth doesn't get fed. However, I think being a hard worker who isn't always boasting about his / her worth all the time will get what they want also.
'Hard work will speak for itself' is a lie, says Stanford career expert: How to really get a raise or promotion​
'Hard work will speak for itself' is a lie, says Stanford career expert: How to really get a raise or promotion​