A survey records the sentence people can defend. A purchase, a cancel, a refill, a share - those reveal the preference that survives contact with price, habit, timing, and friction.
"I make healthy choices."
Watch the basket.
Receipt
chips, soda, delivery fee, again.
Revealed daily ultra-processed calories. The habit wins when dinner is late.
Revealed one-tap login, location on, default sharing. Convenience prices the claim.
Revealed fastest shipping, lowest price, repeat cart. The constraint exposes the cause.
The useful question is not what people say. It is which intervention changes what they do.