The one-question buy box
Your buy box asks zero questions.
The idea: Asking one question above the plans ('Tried magnesium before?') and preselecting the plan that fits the answer raises add-to-cart compared with a static plan list, and raises the share of 3-month plans among people who already take magnesium.
Only the outlined part is new. Everything grey is the same as A.
What’s different
One question, then a recommendation
'Tried magnesium before?' turns three plans into one suggestion, the way a good salesperson would ask first.
First time: start small, guarantee in view
New buyers get one bottle preselected with the 60-night guarantee right beside it.
Already taking it: the routine plan
People who know magnesium get the 3-month plan moved to the top, priced per night.
The answer never changes the price
Every plan stays visible and choosable without answering; only the default and the order change.
Question + matching default vs the same plans with no question. Measure add-to-cart rate, and the 3-month share among 'I take it already' answers.
Personalisation · Choice simplification · Default effect
A hypothesis. Not tested yet.
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