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. 2018 Dec 10;8:17740. doi: 10.1038/s41598-018-36072-1

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Observed proportion of choices to flip the coin (versus rectify the inequality) as a function of participant age group and gender in the control condition in which one party initially had 2 stickers while the other party had 1 sticker. Error bars are bootstrapped 95% confidence intervals; dashed horizontal line represents chance responding.