Automatic Rules
Pre-decide when you are at your best so willpower never has to show up
- Difficulty
- Easy
- Time to result
- ~weeks to results
- Steps
- 5
- Confidence
- 95%
An automatic rule converts a repeated decision into a default. The mechanism is twofold. First, it moves the decision from the moment of weakness — tired, drunk, socially pressured — to a moment of clarity, so the version of you with the best judgment writes the policy. Second, the word 'rule' does social work that a preference cannot: people accept 'I don't eat dessert' but push back on 'I don't want dessert tonight', because we are trained from childhood not to argue with rules. That removes both willpower expenditure and social friction. Rules also kill the internal negotiation loop — a three-days-a-week gym target invites daily debate, while an every-day rule changes the question from 'should I?' to 'how do I fit it in?'
Origin
Parrish got the idea from Daniel Kahneman, who told him 'I have a rule, I never say yes on the phone.' Kahneman's reasoning was that social pressure makes people agree to things they do not want; over years he learned that people do not argue with rules, and that he himself follows them.
Core principles
- 01A rule turns your desired behaviour into your default behaviour.
- 02You write the rule when you are at your best so it governs you when you are at your worst.
- 03People argue with preferences but they do not argue with rules.
- 04Willpower is a battle everyone eventually loses; a rule removes the battle.
- 05Rules must be context-specific and cover the things you would not do naturally.
How to run it
- 1
Find the repeated negotiation
Identify a decision you re-litigate constantly and usually lose — the gym, the dessert, the yes on the phone, the rushed contract.
Pro tip If you hear yourself bargaining ('I'll do extra tomorrow'), you have found a rule candidate.
- 2
Work backwards from the destination
Ask what someone who has already reached your destination does by default, and derive the rule from that behaviour rather than from your current habits.
Watch out Rules copied from someone else's context often fail; they must fit your specific weakness.
- 3
Write it as an absolute, not a target
State it flatly: 'I work out every day', 'I don't drink after nine', 'I never say yes on the phone'. Absolutes have no edge to negotiate at.
Pro tip Broaden the definition instead of loosening the frequency — a five-mile walk still counts as the daily workout.
Watch out A frequency target like three times a week reopens the negotiation every single day.
- 4
Make it socially portable
Phrase it so you can say it out loud without argument. 'It's my rule' or 'it's my policy' ends the conversation where 'I'd rather not' invites persuasion.
Pro tip Ferriss uses 'it's my policy that I only have a cheat day once a week, on Saturday' to close the negotiation entirely.
Watch out Inconsistency destroys the rule's social power; one exception invites permanent renegotiation.
- 5
Keep the rule while flexing the scope
When time or energy is short, shrink the size of the action but never break the rule itself, so the streak and the identity stay intact.
Pro tip Twenty minutes and squats beats a skipped day, because the default survives.
In the wild
A friend of Parrish's ate out constantly for work and was losing the willpower battle at every meal. He set three flat rules: order the healthiest thing on the menu, no alcohol, no dessert. He did not decide meal by meal, and he did not explain his preferences — he stated the rules. Diners pushed back far less than expected, usually needing to hear it only twice. Because he was consistent, the rules stopped being contested at all.
→ He lost a substantial amount of weight without ever spending willpower at the table.
Parrish says he hates working out but wants to be healthy. Three sessions a week failed because every Wednesday triggered an internal negotiation about poor sleep and a heavy workload, ending in 'I'll do extra tomorrow'. He switched to a daily rule with a deliberately loose definition: gym, twenty minutes, or a five-mile walk all qualify. The daily question stopped being whether to exercise and became where to fit it.
→ Consistent daily exercise, a rule he says has changed the habits of many people he has shared it with.
Common mistakes
Setting a frequency instead of an absolute
'Three times a week' leaves the decision open every day, which is exactly the negotiation the rule was supposed to eliminate.
Announcing a preference rather than a rule
'I don't want dessert tonight' invites persuasion and burns willpower; 'I don't eat dessert' is treated as a fact about you.
Rewriting the rule mid-temptation
Amending a rule while tired or under social pressure hands the decision back to the worst version of you, which is what the rule existed to prevent.
Is it for you?
Best for
Anyone whose consistency fails at the point of temptation despite knowing exactly what they should do.
Not ideal for
Genuinely novel, high-stakes, one-off decisions that deserve fresh judgment rather than a standing default.
From the transcript
“automatic rules turn your desired Behavior into your default behavior and they do it when you're at your best”
“he's like I learned over years people don't argue with rules and I follow them”
“eventually everybody loses the battle with willpower so how can you create a system to get out of this willpower thing”
From the episode
#695: Shane Parrish on Wisdom from Warren Buffett, Rules for Better Thinking, How to Reduce Blind Spots, The Dangers of Mental Models, and More