When groups get together for discussions, their decisions tend to be more extreme than any one member would have made alone. This phenomenon is known as:

Answer: Group polarisation

Explanation: Group polarisation is a phenomenon that occurs as a consequence of social behaviour, that is, the joint action of a group within society. All these group behaviours are studied by social psychology, which deals with various aspects, causes and consequences of social life and behaviour. In society, there is a tendency for people to come together in groups as a form and necessity of social life. Then there are causes that lead to, say, decisions made in a group may be more extreme than if an individual made the decision alone. The reason for this is precisely the social behaviour within the group, it is no longer the most important thing to find the best solution, but to satisfy everyone's opinion and the contribution of everyone for the group to function. Group functioning and connecting members within the group are more important than coming up with the best solution. The decision will certainly be made, but it will not be the best because everyone has to participate in the decision making and they are not the best, so one gets a lasting solution as a compromise of all opinions within the group. This decision-making is made for the sake of compromise and the stability of the group as an important aspect of group functioning and an important aspect of acceptable social behaviour. And here is the absurdity: in order to avoid the extreme case of non-functioning of the group as a consequence of the non-participation of all, a more extreme solution is made, which should be for the betterment of society itself, than if the decision was made by someone himself. All this is due, as stated, to social behaviour within the group and the reason for such behaviour is survival and reproduction, in other words, the struggle in society. Because of this, it is often, almost always, the case that decisions are made in groups, when shared knowledge is present, which is often weaker than one's own. There is also group thinking and group polarisation, which is the reason for making more extreme decisions. Group polarisation is, therefore, an approach that does not go into all aspects of the problem being solved, at least not as sophisticated, gradual and comprehensive, as when someone truly dedicated time will make a much better decision.