In German, Scandinavian, and Basque, proportional MOST can combine not only with count plural NPs but also with mass NPs, and correlatively allows collective predicates in the nuclear scope. After arguing against Hackl’s and Hoeksema’s superlative-based analyses, we propose that this “cumulative” MOST (MOSTcum) is a quantificational determiner, which nevertheless differs from MOSTdist: whereas MOSTdist compares the cardinalities of two sets, MOSTcum compares the measures of two entities. The analysis is extended to the proportional reading of MORE in Bulgarian. We also examined majority quantifiers that are not morphologically related to the superlative of MANY/MUCH but nevertheless show the distribution of MOSTcum: Japanese hotondo and Chinese dabufen. This chapter is theoretically interesting for at least two reasons: it deals with the under-studied area of mass quantification, and attempts an explanation for the correlation between (in)definiteness and the various readings of MOST (superlative, distributive proportional quantifier, cumulative proportional quantifier).