Answering the narrow version, because the broad one does not have a single answer. The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either. Those three things can all be true at once, and most arguments here are two people holding different parts of that.
Asked to pay by a method with no recourse, by a supplier I had used twice before without being asked, which is what made me stop.
What I am after is how people are thinking about the trade-off between reversibility and privacy, because you cannot have both.
Practical detail welcome, however dull — the duller the better.
MikeFit_NJ said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
No disagreement, though it depends on where somebody is starting from, and this thread has been assuming a starting point nobody stated.
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Shop Reference StandardsVendorMark said:Asked to pay by a method with no recourse, by a supplier I had used twice before without being asked, which is what made me stop.
Adding a me-too, because a thread of one person's experience is not much use.
Clinical perspective, offered as context rather than as advice. It helps to ask what evidence would change your mind before you look at any. If nothing would, the discussion is not about evidence, and it is better to say so early than to spend nine posts discovering it.