Rule of Five
Require five times the purchase price before calling one item affordable
- Difficulty
- Easy
- Time to result
- ~days to results
- Steps
- 4
- Confidence
- 99%
Take the full cash price of a discretionary purchase and multiply it by five. If you do not have that larger amount available, treat the item as unaffordable and select a version priced at no more than one-fifth of the available cash. The rule rejects two weaker definitions of affordability: qualifying for monthly payments and merely having enough cash to complete the purchase once. By preserving four additional purchase-price units, it creates a deliberate buffer and slows lifestyle inflation. The result will often require a cheaper phone, car, or luxury than social expectations encourage. Money not consumed by the upgrade can remain available for reserves and productive assets. It is a conservative spending heuristic, not a claim that every essential purchase needs five times its price in cash.
Origin
Singh presents the Rule of Five while explaining why having $1,000 in the bank does not make a $1,000 phone comfortably affordable.
Core principles
- 01Ability to make a payment is not affordability
- 02Buying an item should not consume all available cash
- 03A fixed buffer makes spending decisions consistent
- 04The rule deliberately forces a smaller lifestyle
How to run it
- 1
Use the cash price
Find the total purchase price, including unavoidable fees. Ignore the monthly payment offered by a lender or retailer.
- 2
Multiply by five
Calculate five times the full price. Use that amount as the affordability threshold.
Pro tip Apply the test before shopping so desire does not change the rule.
- 3
Compare available cash
Check whether discretionary cash meets the threshold after protecting essential bills and reserves. If it does not, the item fails the test.
Watch out Do not count money already committed to taxes, emergencies, or obligations.
- 4
Downshift or delay
Choose a substitute costing no more than one-fifth of available discretionary cash, or wait until the threshold is reached.
Pro tip Redirect the unspent amount toward an asset rather than another upgrade.
In the wild
A buyer has $1,000 available and wants a $1,000 phone. The Rule of Five rejects the purchase because comfortably buying one would require $5,000. With the current cash, the buyer selects a $200 phone instead and preserves the remaining money.
→ The purchase fits the conservative affordability threshold without financing.
Common mistakes
Testing the monthly payment
The rule is based on the full cash price, not whether a lender can make the payment look small.
Applying it blindly to necessities
The transcript uses the rule for affordability choices, not as a complete policy for every essential or emergency expense.
Is it for you?
Best for
It is best for deciding whether to buy phones, cars, bags, watches, and other non-essential items.
Not ideal for
It is not ideal as a universal rule for necessities, emergencies, housing, or productive investments.
From the transcript
“what I like to do is follow what I call a rule of five, which says if I can't buy five of them, I can't…”
“So, if you got $1,000 in the bank, you can go out and afford comfortably a $200 phone.”
From the episode
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