Decision makers sometimes have to choose between alternative options about which they have no preference: either they judge the options equally valuable (indifference) or they have no judgment about their relative value (noncomparability). Choosing randomly is generally considered a natural way...

Online reputation -"feedback"- mechanism aim to mitigate the moral hazard problem associated with spatially distant exchange among strangers by providing traders with the type of information available in small groups, where members are frequently involved in another's dealings. We compare...