Fig. A1. Screenshot from the Evaluation Task. 2

Electronic Supplementary Materials (ESM) for “Testing Theories about Ethnic Markers: Ingroup Accent Facilitates Coordination, Not Cooperation” by Niels Holm Jensen, Michael Bang Petersen, Henrik Høgh-Olesen, and Michael Ejstrup. Human Nature 26(2), 2015. doi: http://dx.doi.org/10.1007/s12110-015-9229-4

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I see this person as...

1. To a 2. 3. 4. Neither 5. 6 7. To a large nor large degree degree Goal-oriented        Sluggish Trustworthy        Untrustworthy Serious        Indifferent Exciting        Boring Confident        Insecure Smart        Stupid Nice        Unsympathetic Beautiful        Ugly Dominant        Submissive

Fig. A1. Screenshot from the evaluation task. Table A1. Effect of Place-of-Origin Ingroup Accent on Cooperation Behavior.

Model 1 2 3 4 5 6 Dictator Dictator Dictator Trust Game Trust Game Trust Game Dependent Variable Game Game Game Behavior Behavior Behavior Behavior Behavior Behavior Ingroup Accent -0.02 -0.01 (Region of Origin) (0.03) (0.01) Ingroup Accent -0.05 -0.02 (County of Origin) (0.04) (0.02) Ingroup Accent -0.04 -0.05 (City of Origin) (0.09) (0.04) Region of Origin: -0.00 0.03 -0.01 0.06* 0.01 0.03 Copenhagen Metro. (0.04) (0.13) (0.05) (0.02) (0.08) (0.03) Region of Origin: -0.03 0.01 -0.03 0.04 0.06 0.04 Sealand (0.05) (0.06) (0.05) (0.03) (0.04) (0.03) Region of Origin: -0.01 0.01 0.01 0.04 0.05 0.05 Other (0.06) (0.06) (0.06) (0.03) (0.04) (0.03) County of Origin: -0.04 0.05 Copenhagen Metro. (0.14) (0.08) County of Origin: -0.13 -0.04 South West Sealand (0.11) (0.06) County of Origin: -0.03 -0.01 Other (0.05) (0.03) City of Origin: -0.08 0.03 Copenhagen (0.19) (0.12) City of Origin: -0.14 -0.04 Næstved (0.26) (0.15) -0.16 -0.11 City of Origin: Other (0.18) (0.11) 0.06* 0.08* 0.21 -0.02 -0.02 0.08 Constant (0.03) (0.04) (0.18) (0.02) (0.02) (0.11) Observations 18412 18412 18412 18412 18412 18412 R2 0.001 0.001 0.002 Pseudo R2 0.000 0.000 0.000 Notes. Entries are odds ratios from logistic regressions (Models 1-3) and unstandardized regression coefficients from OLS regression models (Models 4-6). Cluster robust standard errors with subject ID as cluster variable are reported in parentheses. For ‘Trust Game Behavior’ the dependent variable is whether the subject chose to send their endowment to the speaker or not. For ‘Dictator Game Behavior’ the dependent variable is the percentage of the endowment send to the speaker (z-scored). For all ingroup variables the reference category is "Outgroup Accent", i.e., that the speaker's accent is associated with another region/county/city than the subject's city. For the geographical variables, the reference category is Jutland (for region) / Central Jutland (for county) / Herning (for city). * p < 0.05, ** p < 0.01, *** p < 0.001 Table A2. Effect of Current-Living-Place Ingroup Accent on Cooperation Behavior.

Model 1 2 3 4 5 6 Dictator Dictator Dictator Trust Game Trust Game Trust Game Dependent Variable Game Game Game Behavior Behavior Behavior Behavior Behavior Behavior Ingroup Accent -0.01 -0.01 (Current Region) (0.03) (0.02) Ingroup Accent -0.04 -0.01 (Current County) (0.04) (0.02) Ingroup Accent -0.00 0.01 (Current City) (0.07) (0.03) Region of Origin: -0.03 -0.02 -0.00 0.10** 0.12*** 0.08** Copenhagen Metro. (0.06) (0.05) (0.04) (0.03) (0.03) (0.03) Region of Origin: -0.04 -0.04 -0.03 0.01 0.04 0.05 Sealand (0.07) (0.05) (0.05) (0.04) (0.03) (0.03) Region of Origin: -0.01 0.00 0.00 0.06 0.06 0.06 Other (0.07) (0.06) (0.06) (0.04) (0.03) (0.03) Current Region: 0.04 -0.09** Copenhagen Metro. (0.05) (0.03) Current Region: -0.01 0.09* Sealand (0.07) (0.04) Current Region: 0.01 -0.02 Other (0.07) (0.04) Current County: 0.03 -0.11** Copenhagen Metro. (0.05) (0.03) Current County: -0.01 0.08 South West Sealand (0.09) (0.06) Current County: -0.04 0.00 Other (0.05) (0.03) Current City: -0.09 -0.14 Copenhagen (0.19) (0.12) Current City: -0.11 0.06 Næstved (0.27) (0.18) -0.12 -0.06 Current City: Other (0.19) (0.12) 0.05 0.08 0.17 -0.01 -0.01 0.04 Constant (0.03) (0.04) (0.18) (0.02) (0.02) (0.11) Observations 18412 18412 18412 18412 18412 18412 R2 0.004 0.003 0.002 Pseudo R2 0.000 0.000 0.000 Notes. Entries are odds ratios from logistic regressions (Models 1-3) and unstandardized regression coefficients from OLS regression models (Models 4-6). Cluster robust standard errors with subject ID as cluster variable are reported in parentheses. For ‘Trust Game Behavior’ the dependent variable is whether the subject chose to send their endowment to the speaker or not. For ‘Dictator Game Behavior’ the dependent variable is the percentage of the endowment send to the speaker (z-scored). For all ingroup variables the reference category is "Outgroup Accent", i.e., that the speaker's accent is associated with another region/county/city than the subject's city. For the geographical variables, the reference category is Jutland (for region) / Central Jutland (for county) / Herning (for city). * p < 0.05, ** p < 0.01, *** p < 0.001 Table A3. Effect of Place-of-Origin Ingroup Accent on Coordination Behavior.

Model 1 2 3 4 5 6 Coordination Coordination Coordination Perceived Perceived Perceived Dependent Game Game Game Likelihood of Likelihood of Likelihood of Variable Behavior Behavior Behavior Success Success Success Ingroup Accent 0.05 0.03* (Region of Origin) (0.03) (0.02) Ingroup Accent 0.02 0.05* (County of Origin) (0.04) (0.02) Ingroup Accent -0.06 -0.01 (City of Origin) (0.09) (0.04) Region of Origin: -0.02 -0.07 -0.02 -0.02 0.05 -0.01 Copenhagen (0.04) (0.14) (0.05) (0.02) (0.06) (0.02) Metro. Region of Origin: 0.01 -0.04 0.00 0.03 0.05 0.02 Sealand (0.05) (0.07) (0.05) (0.02) (0.03) (0.02) Region of Origin: 0.13* 0.07 0.10 0.05 0.05 0.03 Other (0.06) (0.07) (0.06) (0.03) (0.03) (0.03) County of Origin: 0.09 -0.09 Copenhagen (0.15) (0.06) Metro. County of Origin: 0.13 -0.03 South West (0.11) (0.05) Sealand County of Origin: 0.08 -0.01 Other (0.06) (0.03) City of Origin: -0.14 -0.13 Copenhagen (0.18) (0.07) City of Origin: 0.03 0.07 Næstved (0.26) (0.10) City of Origin: -0.18 -0.11 Other (0.17) (0.07) -0.12*** -0.14** 0.08 -0.02 -0.01 0.10 Constant (0.03) (0.04) (0.17) (0.01) (0.02) (0.07) Observations 18412 18412 18412 18412 18412 18412 R2 0.001 0.001 0.001 Pseudo R2 0.000 0.000 0.000 Notes. Entries are odds ratios from logistic regressions (Models 1-3) and unstandardized regression coefficients from OLS regression models (Models 4-6). Cluster robust standard errors with subject ID as cluster variable are reported in parentheses. For ‘Coordination Game Behavior’ the dependent variable is whether the subject chose to engage in the coordination task with the speaker or not. For ‘Perceived Likelihood of Coordination Success' the dependent variable is perceived likelihood measured on a z-scored scale. For all ingroup variables the reference category is "Outgroup Accent", i.e., that the speaker's accent is associated with another region/county/city than the subject's city. For the geographical variables, the reference category is Jutland (for region) / Central Jutland (for county) / Herning (for city). * p < 0.05, ** p < 0.01, *** p < 0.001 Table A4. Effect of Current-Living-Place Ingroup Accent on Coordination Behavior.

Model 1 2 3 4 5 6 Coordination Coordination Coordination Perceived Perceived Perceived Dependent Variable Game Game Game Likelihood of Likelihood of Likelihood of Behavior Behavior Behavior Success Success Success Ingroup Accent 0.08* 0.06*** (Current Region) (0.03) (0.02) Ingroup Accent 0.06 0.08*** (Current County) (0.04) (0.02) Ingroup Accent 0.23** 0.17*** (Current City) (0.07) (0.03) Region of Origin: -0.12* 0.03 Copenhagen Metro. (0.06) (0.02) Region of Origin: 0.07 0.04 Sealand (0.07) (0.03) Region of Origin: -0.11 -0.00 Other (0.08) (0.04) Current Region: 0.05 0.01 -0.00 -0.04 -0.04 -0.03 Copenhagen Metro. (0.06) (0.05) (0.04) (0.02) (0.02) (0.02) Current Region: 0.01 -0.01 0.04 0.02 0.03 0.05 Sealand (0.07) (0.06) (0.05) (0.03) (0.03) (0.02) Current Region: 0.19* 0.10 0.12 0.05 0.04 0.04 Other (0.08) (0.06) (0.06) (0.03) (0.03) (0.03) Current County: -0.05 0.03 Copenhagen Metro. (0.06) (0.02) Current County: 0.23* 0.05 South West Sealand (0.10) (0.04) Current County: 0.07 0.02 Other (0.05) (0.02) Current City: -0.24 -0.02 Copenhagen (0.19) (0.08) Current City: 0.07 -0.05 Næstved (0.30) (0.12) -0.06 0.02 Current City: Other (0.19) (0.08) -0.11*** -0.13** -0.03 -0.04** -0.04* -0.03 Constant (0.03) (0.04) (0.19) (0.01) (0.02) (0.08) Observations 18412 18412 18412 18412 18412 18412 R2 0.001 0.002 0.002 Pseudo R2 0.001 0.001 0.001 Notes. Entries are odds ratios from logistic regressions (Models 1-3) and unstandardized regression coefficients from OLS regression models (Models 4-6). Cluster robust standard errors with subject ID as cluster variable are reported in parentheses. For ‘Coordination Game Behavior’ the dependent variable is whether the subject chose to engage in the coordination task with the speaker or not. For ‘Perceived Likelihood of Coordination Success' the dependent variable is perceived likelihood measured on a z-scored scale. For all ingroup variables the reference category is "Outgroup Accent", i.e., that the speaker's accent is associated with another region/county/city than the subject's city. For the geographical variables, the reference category is Jutland (for region) / Central Jutland (for county) / Herning (for city). * p < 0.05, ** p < 0.01, *** p < 0.001 Table A5. Effect of City-Level Ingroup Accent on Cooperation and Coordination Behavior.

Model 1 2 3 4 5 6 7 8 Trust Trust Dictator Dictator Coordina- Coordina- Perceived Perceived Dependent Game Game Game Game tion Game tion Game Likelihood Likelihood Variable Behavior Behavior Behavior Behavior Behavior Behavior of Success of Success Ingroup Accent -0.04 -0.01 -0.07 -0.00 (City of Origin) (0.10) (0.01) (0.10) (0.01) Ingroup Accent 0.05 0.00 0.28*** 0.05*** (Current City) (0.08) (0.01) (0.08) (0.01) 0.48*** 0.44*** 0.37*** 0.35*** Constant (0.01) (0.00) (0.01) (0.01) Observations 1460 2792 1956 3676 1456 2728 1956 3676 R2 0.001 0.000 0.000 0.008 Pseudo R2 0.000 0.000 0.000 0.006 Notes. Entries are unstandardized coefficients from multilevel logistic regressions (Models 1-2 and 5-6) and unstandardized regression coefficients from regression a multilevel regression model (Models 3-4 and 7-8). All models include fixed effects for subject. Standard errors are reported in parentheses. The N of the models varies because (1) a different number of subjects originates and live, respectively, in the cities and (2) subjects that do not vary in their behavior are automatically excluded due to the subject fixed effects. For ‘Trust Game Behavior’ the dependent variable is whether the subject chose to send their endowment to the speaker or not. For ‘Dictator Game Behavior’ the dependent variable is the percentage of the endowment send to the speaker (scored 0-1). For ‘Coordination Game Behavior’ the dependent variable is whether the subject chose to engage in the coordination task with the speaker or not. For ‘Perceived Likelihood of Coordination Success' the dependent variable is perceived likelihood measured on a 0-1 scale. For both ingroup variables the reference category is "Outgroup Accent", i.e., that the speaker's accent is associated with another city than the subject's city. * p < 0.05, ** p < 0.01, *** p < 0.001