Pennies-a-Day Pricing
Break a price into its smallest unit and it feels like better value
- Difficulty
- Starter
- Time to result
- ~days to results
- Steps
- 5
- Confidence
- 85%
John Gourville's Harvard research found people far more willing to give '$1 a day for a year' than '$365 a year', despite identical sums, because the dollar figure looms large while the unit of time gets too little weight. The same asymmetry works on physical goods: telling people a 12-pack is '$1.58 a bottle' roughly doubled the share who judged $18.99 good value versus quoting the pack price. Klarna and buy-now-pay-later exploit the same effect: three payments of $20 feel very different from one hit of $60 because buyers fixate on the 20 and under-multiply. So for any time-based or divisible product, quote the price in the smallest unit you reasonably can, and willingness to buy rises even though the total is unchanged.
Origin
Extracted from John Gourville's Harvard 'penny-a-day' charity studies and Shotton and Michael Aaron Flicker's Sierra Nevada per-bottle replication, applied to buy-now-pay-later pricing.
Core principles
- 01People overweight the money figure and underweight the time or quantity multiplier
- 023 x 7 feels different from 7 x 3 in the mind
- 03The smaller the unit you quote, the better the value seems
- 04Buyers do not do the multiplication as carefully as they should
How to run it
- 1
Start from the full price
Take the honest total cost of the product or subscription.
Watch out Never misrepresent the total; the reframe is presentational, not deceptive.
- 2
Pick the smallest sensible unit
Divide into per-day, per-bottle or per-instalment figures that fit how the product is used.
Pro tip Match the unit to consumption: per day for services, per bottle for multipacks.
- 3
Lead with the sub-unit
Make the small figure the prominent number in the offer.
Pro tip '$1.58 a bottle' outsells '$18.99 a pack' on perceived value.
- 4
Let the total recede
Keep the full price present but visually secondary to the unit price.
Pro tip Instalment plans work because buyers fixate on the small payment, not the sum.
- 5
Align unit to time or quantity
Use time units for ongoing products and quantity units for packs, matching how buyers experience the spend.
In the wild
John Gourville asked people to donate to charity, framing the ask sometimes as $365 a year and sometimes as a dollar a day. Despite the identical annual sum, far more people agreed to the dollar-a-day version because the money figure dominates attention and the time unit is under-weighted.
→ Materially higher donation rates from the smaller-unit framing.
Buying a $60 jumper feels different when paid as three instalments of $20; people fixate on the 20 and under-multiply, so the purchase feels lighter. Retailers adding Klarna sell more, which is why they hand over commission.
→ Higher conversion for retailers offering instalment framing.
Common mistakes
Quoting only the big total
Leading with the full price makes divisible products feel expensive and suppresses conversion even when the per-use cost is tiny.
Forcing an unnatural unit
Splitting a one-off purchase into a contrived per-day figure feels manipulative and can backfire.
Is it for you?
Best for
Subscriptions, instalment offers, multipacks and time-based products where a total can be split into small units.
Not ideal for
One-off purchases where quoting a per-day figure would feel contrived or misleading.
From the transcript
“you break down a physical item into smaller sub units, and you create a perception it's better value”
“People treat three lots of 20 completely different from one hit of 60 because they're focusing too much on the 20”
From the episode
11 Psychology Tricks From the World’s Best Brands - Richard Shotton - #1053
Richard Shotton