TY - GEN A1 - Huber, Christoph A1 - Dreber, Anna A1 - Huber, Jürgen A1 - Johannesson, Magnus A1 - Kirchler, Michael A1 - Weitzel, Utz A1 - Abellán, Miguel A1 - Adayeva, Xeniya A1 - Ay, Fehime Ceren A1 - Barron, Kai A1 - Berry, Zachariah A1 - Bönte, Werner A1 - Brütt, Katharina A1 - Bulutay, Muhammed A1 - Campos-Mercade, Pol A1 - Cardella, Eric A1 - Claassen, Maria Almudena A1 - Cornelissen, Gert A1 - Dawson, Ian G. J. A1 - Delnoij, Joyce A1 - Demiral, Elif E. A1 - Dimant, Eugen A1 - Doerflinger, Johannes Theodor A1 - Dold, Malte A1 - Emery, Cécile A1 - Fiala, Lenka A1 - Fiedler, Susann A1 - Freddi, Eleonora A1 - Fries, Tilman A1 - Gasiorowska, Agata A1 - Glogowsky, Ulrich A1 - Gorny, Paul Matthias A1 - Gretton, Jeremy David A1 - Grohmann, Antonia A1 - Hafenbrädl, Sebastian A1 - Handgraaf, Michel A1 - Hanoch, Yaniv A1 - Hart, Einav A1 - Hennig, Max A1 - Hudja, Stanton A1 - Hütter, Mandy A1 - Hyndman, Kyle A1 - Ioannidis, Konstantinos A1 - Isler, Ozan A1 - Jeworrek, Sabrina A1 - Jolles, Daniel A1 - Juanchich, Marie A1 - Raghabendra, Pratap K.C. A1 - Khadjavi, Menusch A1 - Kugler, Tamar A1 - Li, Shuwen A1 - Lucas, Brian A1 - Mak, Vincent A1 - Mechtel, Mario A1 - Merkle, Christoph A1 - Meyers, Ethan Andrew A1 - Mollerstrom, Johanna A1 - Nesterov, Alexander A1 - Neyse, Levent A1 - Nieken, Petra A1 - Nussberger, Anne-Marie A1 - Palumbo, Helena A1 - Peters, Kim A1 - Pirrone, Angelo A1 - Qin, Xiangdong A1 - Rahal, Rima Maria A1 - Rau, Holger A1 - Rincke, Johannes A1 - Ronzani, Piero A1 - Roth, Yefim A1 - Saral, Ali Seyhun A1 - Schmitz, Jan A1 - Schneider, Florian A1 - Schram, Arthur A1 - Schudy, Simeon A1 - Schweitzer, Maurice E. A1 - Schwieren, Christiane A1 - Scopelliti, Irene A1 - Sirota, Miroslav A1 - Sonnemans, Joep A1 - Soraperra, Ivan A1 - Spantig, Lisa A1 - Steimanis, Ivo A1 - Steinmetz, Janina A1 - Suetens, Sigrid A1 - Theodoropoulou, Andriana A1 - Urbig, Diemo A1 - Vorlaufer, Tobias A1 - Waibel, Joschka A1 - Woods, Daniel A1 - Yakobi, Ofir A1 - Yilmaz, Onurcan A1 - Zaleskiewicz, Tomasz A1 - Zeisberger, Stefan A1 - Holzmeister, Felix T1 - Competition and moral behavior: A meta-analysis of forty-five crowd-sourced experimental designs T2 - Proceedings of the National Academy of Sciences N2 - Does competition affect moral behavior? This fundamental question has been debated among leading scholars for centuries, and more recently, it has been tested in experimental studies yielding a body of rather inconclusive empirical evidence. A potential source of ambivalent empirical results on the same hypothesis is design heterogeneity—variation in true effect sizes across various reasonable experimental research protocols. To provide further evidence on whether competition affects moral behavior and to examine whether the generalizability of a single experimental study is jeopardized by design heterogeneity, we invited independent research teams to contribute experimental designs to a crowd-sourced project. In a large-scale online data collection, 18,123 experimental participants were randomly allocated to 45 randomly selected experimental designs out of 95 submitted designs. We find a small adverse effect of competition on moral behavior in a meta-analysis of the pooled data. The crowd-sourced design of our study allows for a clean identification and estimation of the variation in effect sizes above and beyond what could be expected due to sampling variance. We find substantial design heterogeneity—estimated to be about 1.6 times as large as the average standard error of effect size estimates of the 45 research designs—indicating that the informativeness and generalizability of results based on a single experimental design are limited. Drawing strong conclusions about the underlying hypotheses in the presence of substantive design heterogeneity requires moving toward much larger data collections on various experimental designs testing the same hypothesis. Y1 - 2023 UR - https://opus4.kobv.de/opus4-UBICO/frontdoor/index/index/docId/31499 SN - 0027-8424 SN - 1091-6490 VL - 120 IS - 23 ER -