Abstract
Two experiments were performed, involving a similar method. Experiment I showed for the first time that group discussion can produce a shift toward greater risk in choices among bets. A risky shift was found in two dimensions of risk taking: probability preferences and stake preferences. This finding made it possible to use bets in the second experiment. In Experiment II, no risky shift was found in a group decision where the members of the group had engaged in past discussions about other issues but were not permitted to discuss or exchange information about the current issue. This result casts doubt on the diffusion of responsibility theory about the risky shift.
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