Summary here: https://www.forbes.com/sites/fredericka ... ceccad3288
It's rather self-explanatory. Powerful people become overconfident and think excessively of their judgment which results in inefficient decisions. Presumptions are made based on the success of past decisions despite changing circumstances, and the ability to handle flaws is used to compensate in advance for mistakes.
IOW, it makes you careless so you literally don't think about how things make sense.