Some unwritten rules can be strong. For example, the captain of a ship is always expected to be the last to evacuate it in a disaster.
In the workplace, unspoken rules can have a significant impact on one’s job satisfaction, advancement opportunities, and career trajectory. For example, research conducted in the United States by the Level Playing Field Institute and the Center for Survey Research and Analysis at the University of Connecticut revealed that 36% of white women, 37% of women of color, and 33% of men of color identified the fact that only certain people are part of important social groups at work as the greatest obstacle to fairness in their workplaces (LPFI/CSRA 2003).
The HOW-FAIR study 2003: How opportunities in the workplace and fairness affect intergroup relations. Level Playing Field Institute, San Francisco.