Choose the Right Sunk Costs
Precommit resources so backing out of an essential plan becomes painful
- Difficulty
- Easy
- Time to result
- ~weeks to results
- Steps
- 5
- Confidence
- 92%
Choose the Right Sunk Costs deliberately recruits commitment bias instead of merely warning against it. First decide that a future action is genuinely valuable, especially for a priority that will not happen automatically. Schedule it, secure the other participants' commitment, and invest an appropriate amount of money or effort that cannot be fully recovered. When the date approaches and convenience favors cancellation, the sunk cost makes backing out painful enough to support follow-through. The mechanism does not make a bad plan good, and it should never trap someone in an unsafe situation. Its value comes from placing the commitment device after sound judgment, so a predictable future preference for avoidance cannot easily erase today's essential decision.
Origin
Tim Ferriss described booking time with close family and friends, obtaining commitments, and using trip costs to make undoing those plans painful.
Core principles
- 01Commitment bias can support good decisions
- 02Important plans rarely protect themselves
- 03A cost paid in advance raises the price of avoidance
- 04Precommit only after deciding the action is right
How to run it
- 1
Choose the essential plan
Identify a relationship or wellbeing action that matters and is unlikely to occur by itself.
Pro tip Use the method only after deciding the activity is right on its merits.
Watch out Commitment cannot repair a poorly chosen plan.
- 2
Fix the time
Place the activity in the calendar rather than leaving it as an aspiration.
- 3
Create mutual commitment
Get clear agreement from the other people involved so the plan carries social as well as personal weight.
Watch out Do not pressure others into a commitment they do not want.
- 4
Add a proportionate sunk cost
Book or pay enough in advance that casual cancellation becomes meaningfully painful.
Pro tip Keep the cost proportionate to the plan and your means.
Watch out Never use a sunk cost to justify staying in an abusive or unsafe situation.
- 5
Honor the good decision
When short-term reluctance arrives, let the prior commitment help preserve the action you already judged worthwhile.
Watch out Materially changed circumstances can still justify cancellation.
In the wild
Tim blocks trips and visits with immediate family and closest friends, gains their commitment, and pays costs in advance. Canceling then becomes painful rather than effortless when work or inertia competes with the plan.
→ The relationships receive protected time that would be unlikely to appear accidentally.
Common mistakes
Committing before judging
The method amplifies follow-through, so it must come after confirming that the underlying action is worthwhile.
Using excessive cost
The commitment should resist casual avoidance without creating financial harm or blocking a necessary exit.
Is it for you?
Best for
Trips, visits, and scheduled experiences that matter but are vulnerable to work pressure or changing mood.
Not ideal for
Uncertain, unsafe, or high-cost commitments where new information should make exit easy.
From the transcript
“I'm blocking out time in the calendar getting commitments for say trips or people coming to visit”
“choosing the right sunk costs”
“you do want to be locked in”
From the episode
#719: Walk & Talk with Greg McKeown — How to Find Your Purpose and Master Essentialism in 2024