In the behavioral research I’ve conducted over the past 20 years, I’ve uncovered a disturbing pattern: While people usually gain power through traits and actions that advance the interests of others, such as empathy, collaboration, openness, fairness, and sharing; when they start to feel powerful or enjoy a position of privilege, those qualities begin to fade. The powerful are more likely than other people to engage in rude, selfish, and unethical behavior. The 19th-century historian and politician Lord Acton got it right: Power does tend to corrupt.

A version of this article appeared in the October 2016 issue (pp.108–111) of Harvard Business Review.