Reciprocity:Choice shift in a social trap

In the present study it was investigated if choice behaviour in a social trap situation was affected by feedback about the choice of others. On top of the social trap reward structure investigated by Schroeder, Jensen, Reed, Sullivan and Schwab (1983) a bonus was added. In the individual bonus condition subjects were promised an unspecified bonus if they would obtain more points than any other group member of one's group. In the group bonus condition subjects would obtain a bonus if the own group acquired more points than the other group.As expected, in the group bonus condition one took fewer points than in the individual bonus condition. As suggested by the reciprocity explanation of choice behaviour (Liebrand, Wilke, Vogel and Wolters 1986; Liebrand, Jansen and Rijken 1986) it appeared that first choice corresponded strongly with one's expectations about the choices of others. Before the second choice and also before the third choice one received purported feedback about the choices of other members of one's group. In the conserving condition one learned that all others made a conserving choice, whereas in the consuming condition one learned that all others made a consuming choice. According to the reciprocity explanation it was found that when choice behaviour was in agreement with own previous expectations and previous choice, no choice change did occur. Shifts took place in conditions in which own previous expectations about the choices of others and own choice were disconfirmed by information about choices of others