Behaviour (Fogg B=MAP)
Cost Simplicity
How costly is it?
What it is
Money is an Ability lever — lower, clearer, or honest cost makes action easier. Hidden cost is felt as a betrayal.
Why it works
Money is one of Fogg''s six simplicity factors, and in B=MAP the binding constraint is whichever resource is scarcest for that user at that moment — for many purchases it is cost, but the design lever is rarely the number itself. It is the certainty of the number. Behavioural research on price framing finds that the pain of paying is driven by salience and surprise as much as by amount, which is why a cost revealed late is felt far more sharply than the same cost known from the start. Drip pricing, where the headline figure grows through the checkout, is now the subject of specific regulatory action in several markets precisely because the harm is measurable. Clear pricing is therefore an ability lever: it removes the uncertainty that stops people acting, without changing what they pay.
How to apply it in design
Show price honestly and early. Hidden fees, contrived tier structures, and decision-overload pricing pages reduce ability. Price clarity is a craft skill, not an accident.
Where you'll see it
- Total price including fees and tax shown from the first screen
- Plans differentiated on one axis the buyer actually cares about
- The recommended option marked, so the default requires no analysis
- Cost expressed in the unit the buyer thinks in, not the one you bill in
- What is excluded stated as plainly as what is included
Example
A boutique hotel listing "€340/night, breakfast included, no resort fee" upfront converts better than "from €280" that climbs at checkout.
Failure mode
"Contact us for pricing" on a commodity offer is a friction signal, not a luxury one. The user assumes you have something to hide.
When not to use it
Public pricing genuinely does not fit every model. Where scope legitimately determines cost — bespoke work, enterprise implementations, anything quoted per requirement — a fabricated number is worse than an honest range. The answer there is a range plus the variables that move it, not silence. Price prominence is also wrong when cost is not the buyer''s real constraint: leading with cheapness in a category bought on trust or craft actively undermines the positioning, because in those markets a low price is read as evidence about quality.
The ethical line
Drip pricing is the abuse, and it is no longer merely bad practice — mandatory all-in pricing rules have been introduced in the US, UK and EU in response to it. The pattern is familiar: a headline price that grows through checkout with service fees, resort fees and processing charges the buyer could not have anticipated. Adjacent to it sits the pricing page engineered so the middle tier looks obvious through decoy options nobody is meant to buy. The test is whether the buyer, seeing the full breakdown upfront, would have made the same choice. If the structure depends on them not seeing it until late, the structure is the problem.
What to measure
Track abandonment at the exact step where the total changes — that delta is the cost of your pricing presentation. Compare it against a variant with all-in pricing from the first screen, and read refund rate alongside conversion.
Frequently asked questions
What is cost simplicity in the Fogg Behavior Model?
Money is one of the six simplicity factors that determine Ability in B=MAP. An action is easier when it costs less, and also when the cost is clear and known in advance, because uncertainty about price is itself a barrier independent of the amount.
What is drip pricing?
Drip pricing is showing a low headline price and adding mandatory fees during checkout, so the final total is higher than advertised. It is now restricted by all-in pricing rules in the US, UK and EU, because the practice reliably misleads buyers about what they will actually pay.
Should you show prices on your website?
Yes, whenever a real price exists. Hiding it on a comparable, commoditised offer reads as a friction tactic rather than an exclusivity signal. Where scope genuinely determines cost, publish a range and the variables that move it rather than nothing at all.
How many pricing tiers should a product have?
Few enough that the differences are graspable at a glance, and differentiated on an axis the buyer actually cares about. Three is common because it allows a clear recommended middle. What matters more than the count is that each tier answers an obvious question about who it is for.
Related skills
Source: Growth.Design — B=MAP (Ability)
Practise Cost Simplicity on a real brief
Quest gives you a client brief that targets this skill and 60 minutes to ship an iteration.