Biases › Technique
Technique
Partitioned pricing
Splitting a price into a base price plus surcharges can make the total seem lower.
Morwitz, Greenleaf & Johnson (1998), Divide and Prosper: Consumers' Reactions to Partitioned Prices.
What is Partitioned pricing?
Partitioned pricing is a behavioural design principle (technique family): splitting a price into a base price plus surcharges can make the total seem lower. Base price plus shipping, service or booking fees. Nudgeswipe rates the evidence as strong. Source: Morwitz, Greenleaf & Johnson (1998), Divide and Prosper: Consumers' Reactions to Partitioned Prices.
The research
Base price plus shipping, service or booking fees.
● Strong evidence (provisional)
Provisional rating: we cite only the original paper so far. It stays provisional until a replication or meta-analysis is added.
This is a technique, not a bias. It relies on Anchoring.
Source: doi.org/10.2307/3152164
Key takeaways
- Honest nudge
Show the all-in price prominently.
Example: Argos puts its delivery fees in the header, next to "A year of fast delivery with Argos Plus" → - Dark-pattern line
Drip pricing: mandatory fees revealed late.
Use it
Apply this with your agent
The prompt carries this bias, its evidence rating and the honest-vs-dark line.
ChatGPT, Claude, Grok and Cursor open with the prompt filled in (it is also copied, in case the prefill doesn't load). Gemini and Codex don't support prefilled links, so the prompt is copied and the app opens; paste it in.
Frequently asked questions
What is Partitioned pricing?
Partitioned pricing is a behavioural design principle: splitting a price into a base price plus surcharges can make the total seem lower.
How does Partitioned pricing work?
Base price plus shipping, service or booking fees.
How strong is the evidence for Partitioned pricing?
Nudgeswipe rates it strong evidence (provisional). Original source: Morwitz, Greenleaf & Johnson (1998), Divide and Prosper: Consumers' Reactions to Partitioned Prices.
How can you use Partitioned pricing honestly?
Show the all-in price prominently.
When does Partitioned pricing become a dark pattern?
Drip pricing: mandatory fees revealed late.
Which brands use Partitioned pricing?
Nudgeswipe has 4 teardowns of brands using it, including Argos, Jet2holidays, EE, Three. Whether it lifted their results is not public unless a teardown cites it.
In the wild
4 real examples
Argos puts its delivery fees in the header, next to "A year of fast delivery with Argos Plus"
Argos · Homepage · £ as captured
Jet2holidays leads with a "£60pp deposit" and lists what is included
Jet2holidays · Homepage · £ as captured
EE prints each future price rise in pounds and pence under the headline monthly price
EE · Homepage · £ as captured
Three leads with "Save up to £1035" on trade-in and dates its price rises
Three · Homepage · £ as captured
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