Regret-Minimization Decision Rule
Choose the path whose rejection would create the more enduring regret
- Difficulty
- Starter
- Time to result
- ~days to results
- Steps
- 5
- Confidence
- 99%
Frame the choice as two complete futures: one in which you act and later wish you had not, and one in which you decline and later wish you had tried. Evaluate not only the probability of disappointment but also its depth, duration, and reversibility. The rule corrects a common bias toward preserving present comfort because it makes the hidden cost of inaction explicit. Mack used this comparison when deciding whether to leave an unstructured period of leisure and take on the difficult Credit Suisse First Boston turnaround. He concluded that trying and regretting the job would be preferable to permanently wondering what might have happened.
Origin
Extracted from Masters in Business through John Mack's explanation of why he accepted the challenge of restructuring Credit Suisse First Boston.
Core principles
- 01Compare long-term regrets rather than short-term comfort
- 02Include the cost of inaction in every decision
- 03Accept that either choice may produce regret
- 04Prefer reversible discomfort over lasting unanswered questions
How to run it
- 1
State the alternatives
Reduce the decision to the meaningful act-versus-decline choice without adding artificial intermediate options.
Pro tip Write each alternative as a specific action with a date.
Watch out Do not oversimplify if several genuinely distinct choices exist.
- 2
Simulate regret after acting
Imagine that you accept the opportunity and it goes badly. Identify the likely losses, lessons, and recovery path.
Pro tip Distinguish temporary embarrassment from lasting damage.
Watch out Do not minimize financial, health, or family consequences.
- 3
Simulate regret after declining
Imagine looking back after the opportunity has disappeared. Assess whether the unanswered possibility would continue to matter.
Pro tip Use a multi-year horizon rather than tomorrow's emotional relief.
Watch out Fear of missing out is not automatically evidence of meaningful regret.
- 4
Compare reversibility and duration
Determine which regret would be easier to repair and which would persist longest.
Pro tip Give special weight to options that preserve future agency.
Watch out Low reversibility can outweigh emotional preference.
- 5
Choose and document
Select the alternative with the more acceptable regret profile and record why it won.
Pro tip Use the written rationale to resist second-guessing caused by short-term discomfort.
Watch out The rule improves the decision process; it does not guarantee a favorable outcome.
In the wild
After leaving Morgan Stanley, Mack was uncertain about his next chapter and was approached about a troubled Credit Suisse First Boston. He decided that attempting the turnaround and regretting the experience would be easier to live with than declining and regretting the missed opportunity.
→ He accepted the role and led the business back toward profitability before his contract was not renewed.
A product leader compares joining a risky startup with remaining in a comfortable corporate post. Failure at the startup would cost time and income but leave employable experience; declining would leave a rare mission-aligned opportunity permanently unexplored.
→ The leader makes the choice using the durability and reversibility of each possible regret.
Common mistakes
Treating all regret as equal
A brief disappointment and a lifelong unanswered question should not receive the same weight.
Ignoring catastrophic downside
Regret minimization cannot replace safety, solvency, legal, or ethical constraints.
Using excitement as the answer
The method requires comparing complete downside scenarios, not simply choosing the more adventurous option.
Is it for you?
Best for
It is best for consequential career or life opportunities where inaction could remain emotionally costly for years.
Not ideal for
It is not ideal for decisions with catastrophic or irreversible downside that require formal risk analysis.
From the transcript
“I would rather do this job and regret it then not do this job and regret it.”
From the episode
John Mack on Life Lessons From Financial Crisis
John Mack