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Key Takeaways Jamie Dimon says one of the key lessons he has “learned and relearned” is to avoid making big decisions on Fridays when you’re tired because it increases the risk of poor judgment.
Dimon stresses emotional discipline as a core leadership skill, warning that anger can undermine decision-making.
Underneath his advice is a broader belief that people should ground their careers in a clear purpose — treating others well, doing their best, and leaving the world a better place.
JPMorgan Chase CEO Jamie Dimon’s latest career secret is simple: never make big decisions when you are exhausted, especially at the end of the week.
“Making big decisions on a Friday when you’re tired is a really bad idea,” Dimon said in a recent interview with NPR, when asked to reflect on what he wished his younger self had known.
During the interview, Dimon also framed emotional discipline as crucial to leadership. “Anger doesn’t help,” he said, talking about the kinds of emotions that can throw off a leader’s judgment and another lesson he learned.
Dimon, who turned 70 last month, has spent over two decades running JPMorgan, the largest U.S. bank. He said he has “learned and relearned” those lessons over time and admitted that he isn’t perfect: “I still make some of those mistakes, unfortunately,” he said.
The dangers of decision fatigue
Thomas Roulet, who teaches organizational sociology and leadership at the University of Cambridge, told Business Insider that Dimon is right — ”decision fatigue,” or a deteriorating ability to process information, can be dangerous. He added that a CEO might feel pressured to make a quick decision as the week wraps up, which can lead to doing so without all the facts or without checking in with the right people first.
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