Abstract
There is ample evidence that people differ considerably in their preferences. We identify individual heterogeneity in type and strength of social preferences in a series of binary three-person dictator games. Based on this identification, we analyze response times in another series of games to investigate the cognitive processes of distributional preferences. We find that response time increases with the number of conflicts between individually relevant motives and decreases with the utility difference between choice options. The selfish motive is more intuitive for subjects who are more selfish. Our findings indicate that the sequential sampling process and the intuition of selfishness jointly produce distribution decisions, and provide an explanation for the mixed results on the correlations between response time and prosociality. Our results also show that it is important to take heterogeneity of preferences into account when investigating the cognitive processes of social decision making.
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Notes
Supplementary Material A lists the 64 games.
Finite mixture models have a long history and a comprehensive description of the models can be found in McLachlan et al. (2019).
Due to the definitions of differences, there exists a linear relationship between DiffFS-α, DiffFS-β and DiffEfficiency, that is, DiffEfficiency = 2(DiffFS-β − DiffFS-α).
We conducted the finite mixture analysis using the R package flexmix (Grün and Leisch 2008).
In Model I, all subjects can be classified into their types with probabilities of greater than 0.93, and 93.3% of all subjects are classified into their types with probabilities of greater than 0.99. In Model II, only one subject is classified into her type with the probability of less than 0.90 (0.895), and 91.4% of all subjects are classified into their types with probabilities of greater than 0.99. In Model III, only one subject is classified into her type with the probability of less than 0.90 (0.88), and 92.4% of all subjects are classified into their types with probabilities of greater than 0.99. In Model IV, two subjects are classified into their types with probabilities of less than 0.90 (0.79 and 0.86), and 95.2% of all subjects are classified into their types with probabilities of greater than 0.99.
The regression results of Model I, Model II, and Model III are shown in Table A2.
One exception is the coefficient of SignEnvy for subjects of the first norm type in Model I. Envy is inequality aversion toward the person with the highest income. If people care about efficiency, they might like situations that envious people dislike. The relevant motives for each norm type in Model I, Model II, and Model III are shown in Table A3. Apart from some minor differences, all four models identify almost identical norm types.
The posterior probabilities for Model I, Model II, and Model III are shown in Fig. A1 in Supplementary Material A.
The evolution and the distributions of RTs in the experiment are shown in “The evolution of mean response time” and “The distribution of response times in the second-party decisions” in Supplementaery Material B.
To test the robustness of our results, we also conducted the analysis using untransformed RT, which essentially leads to the same results.
Theoretically, it is difficult to put these incorrect decisions into conflict decisions or consistent decisions. On one hand, in these incorrect decisions, all the motives point to the same option, and in this sense, they can be considered to be consistent situations (decisions). On the other hand, the incorrect decisions can also be considered as conflict decisions since choices for these situations are against all the motives. Regardless of whether we consider these decisions to be conflict or consistent decisions, it does not affect the main results.
Here we separate selfishness from the other motives when calculating the utility. We also run additional analyses in which we take both the selfish motive and social motives into account, and the results are similar. In particular, utility difference is a significant explanatory variable for response time.
We also use random samples to test the correlation between RT and the utility difference at the individual level. Specifically, we randomly select half of the data for 100 times, and then we use the selected data to predict the correlation in the other half of the data in each of the 100 times. The results show that there are 73 subjects who always have a positive correlation in all the 100 times, which is different from the chance level of 50% (two-sided binomial test, p < 10-4).
Regression (1) in Table 7 is the regression results for the odd trials in conflict decisions. The regression results for the even trials in conflict decisions are shown in regression (1) in Table C3.
We also checked whether subjects’ selfish behavior is consistent over the rounds. The results show that the strength of selfishness (i.e., the frequency of choosing the selfish option in conflict decisions) in the first half rounds is not different from that in the second half rounds (Wilcoxon signed-rank test, p = 0.303).
We also calculate the strength of selfishness using the odd trials and study the RT in the even trials of conflict decisions. The results are similar and shown in Supplementary Material C.
The results are shown in Supplementary Material D.
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Acknowledgements
We would like to thank Carlos Alós-Ferrer, Dominik Bauer, Colin Camerer, David Dohmen, Fabian Dvorak, Gerald Eisenkopf, Ernst Fehr, David Grammling, Jan Hausfeld, Konstantin Hesler, Ian Krajbich, Daniel Martin, Gideon Nave, David Rand, Katrin Schmelz, Simeon Schudy, Roberto Weber and Irenaeus Wolf as well as participants of 2014 ESA European Meeting in Prague, 2014 Zurich Workshop on Experimental and Behavioral Economic Research, the Second International Meeting on Experimental and Behavioral Social Sciences in Toulouse for helpful comments and discussions. Fadong Chen gratefully acknowledges support from the National Natural Science Foundation of China (Grant No. 71803174), the Qiantang River Talents Program, and the Fundamental Research Funds for the Central Universities in China. Urs Fischbacher gratefully acknowledges support from the German Research Foundation (DFG) through research unit FOR 1882 “Psychoeconomics”.
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Chen, F., Fischbacher, U. Cognitive processes underlying distributional preferences: a response time study. Exp Econ 23, 421–446 (2020). https://doi.org/10.1007/s10683-019-09618-x
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DOI: https://doi.org/10.1007/s10683-019-09618-x