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Malthouse, Eugene ORCID: https://orcid.org/0000-0001-5665-7501, Pilgrim, Charlie ORCID: https://orcid.org/0000-0002-3800-677X, Sgroi, Daniel ORCID: https://orcid.org/0000-0001-9575-2640, Accerenzi, Michela ORCID: https://orcid.org/0000-0002-1163-3132, Alfonso, Antonio ORCID: https://orcid.org/0000-0002-5396-3711, Ashraf, Rana Umair ORCID: https://orcid.org/0000-0002-0152-8419, Baard, Max ORCID: https://orcid.org/0009-0004-2836-7936, Banerjee, Sanchayan ORCID: https://orcid.org/0000-0002-0176-0429, Belianin, Alexis ORCID: https://orcid.org/0000-0002-0874-8393, Bhattacharjee, Swagata ORCID: https://orcid.org/0009-0007-8540-474X, Bhattacharya, Mihir ORCID: https://orcid.org/0000-0002-9813-671X, Brañas-Garza, Pablo ORCID: https://orcid.org/0000-0001-8456-6009, Cárdenas, Juan-Camilo ORCID: https://orcid.org/0000-0003-0005-7595, Carriquiry, Miguel ORCID: https://orcid.org/0000-0002-1032-8056, Choi, Syngjoo ORCID: https://orcid.org/0000-0003-4006-0377, Clochard, Gwen-Jiro ORCID: https://orcid.org/0009-0004-5513-4193, Denzon, Eduardo Ezekiel ORCID: https://orcid.org/0009-0006-0072-3489, Dessoulavy-Sliwinski, Bartlomiej ORCID: https://orcid.org/0000-0002-4395-9815, Dini, Giorgio ORCID: https://orcid.org/0009-0000-2514-3129, Dong, Lu ORCID: https://orcid.org/0000-0001-9785-2442, Ertl, Antal ORCID: https://orcid.org/0000-0002-8371-8418, Exadaktylos, Filippos ORCID: https://orcid.org/0000-0001-7339-8847, Filiz-Ozbay, Emel ORCID: https://orcid.org/0000-0003-3099-2971, Flecke, Sarah Lynn ORCID: https://orcid.org/0009-0008-1402-2207, Galeotti, Fabio ORCID: https://orcid.org/0000-0003-0221-5470, Garcia-Muñoz, Teresa ORCID: https://orcid.org/0000-0003-1778-254X, Hanaki, Nobuyuki ORCID: https://orcid.org/0000-0003-3127-690X, Hollard, Guillaume ORCID: https://orcid.org/0000-0001-7994-4546, Horn, Dániel ORCID: https://orcid.org/0000-0002-2888-6240, Huang, Lingbo ORCID: https://orcid.org/0000-0003-2713-6867 and Kiss, Hubert János ORCID: https://orcid.org/0000-0003-3666-9331 (2026) The private solution trap in collective action problems across 34 nations. Proceedings of the National Academy of Sciences of the United States of America, 123 (12). DOI 10.1073/pnas.2504632123