Requirements on the social choice function (1/2)

1) Non trivial

There are at least two DMs and three alternatives

2) Complete and transitive Ri:s

If x ? y ? x Ri y ? y Ri x (i.e. all DMs have an opinion)

If x Ri y ? y Ri z ? x Ri z

3) f is defined for all Ri:s

The group has a well defined preference relation, regardless of what the individual preferences are

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