When you picture achieving success, you probably imagine a graph rising steadily to the right, with the top point of the line being somewhere around fulfillment, lots of cash and real authority in your field.

Reality check–the graph often rises to a given point, then cuts sharply to the horizontal and stays there.

It’s a situation known for decades as the Peter Principle. The concept, made famous based on research from Lawrence J. Peter published in 1969, says that people rise to the level of their incompetence. You’ll keep getting promoted until you simply don’t have the skills or knowhow to get any further. And at that point, your career takes a seat and stagnates.