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One interesting aspect of this button is, at least where I have seen it, an anonymous vote. I think there is a reason why this element works better than a normal button when in an anonymous setting. I think part of it is it's novelty but I think it's more about people associating "like"-type buttons with their twitter/google/reddit/facebook accounts. I think ...


Here is a graph from the Wikipedia page of Psychological Pricing. It is self-explanation.

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