Reminds me of a story in which a day care started charging fees for parents who were late picking up their kids. The behavior of the parents then changed, from regarding tardiness as a moral failure, to viewing it as something they could pay for, whenever they wanted to, and therefore the amount of late parents <i>increased</i>. The way I heard it, the day care did not want this, and so they removed the fee. But the outlook of the parents had irrevocably changed, and since being late was now <i>free</i>, they started to be <i>even more late</i>. There was no going back.<p>I believe that this is the study in question, but I have not verified whether my recollection above (of the story as it was told to me) matches the actual study:<p><<a href="https://www.researchgate.net/publication/2587744_A_Fine_is_a_Price" rel="nofollow noreferrer">https://www.researchgate.net/publication/2587744_A_Fine_is_a...</a>>