Risky Shift

The risky shift is the finding that groups making a decision together often arrive at a riskier choice than the average of what individual members would have chosen on their own before the group met. MIT student James Stoner first documented the phenomenon in an unpublished 1961 master's thesis, a result that surprised earlier researchers who had expected group discussion to average out individual preferences rather than amplify them. The mechanism works through the deliberation itself: individuals enter a group discussion already leaning toward some level of risk, and as members exchange arguments and perspectives that reinforce those existing leanings, the group's final decision is pushed further in that direction, toward greater risk when members began risk-inclined. Later research found that the same deliberative process can instead push a group toward greater caution when members initially favor safer choices, and the risky shift came to be understood as one manifestation of the broader phenomenon of group polarization, in which group discussion intensifies members' pre-existing tendencies rather than moderating them toward a middle ground.