We characterize a new quasi-ordering on the collection of opportunity (or choice) sets. This new rule combines two criteria: the individual preferences on the universal set of options and the number of maximal options in the opportunity set. This new rule is compared with the indirect utility...

The ethical view of prioritarianism holds the following: if an extra bundle of attributes is to be allocated to either of two individuals, then priority should be given to the worse off among the two. We consider multidimensional poverty comparisons with cardinal and ordinal attributes and...

The existence of a Paretian and finitely anonymous ordering in the set of infinite utility streams implies the existence of a non-Ramsey set (a nonconstructive object whose existence requires the axiom of choice). Therefore, each Paretian and finitely anonymous quasi-ordering either is...