I show that the contemporary dominant analysis of natural language quantifiers that are one-place determiners by means of binary generalized quantifiers has failed to explain why they are, according to it, conservative. I then present an alternative, Geachean analysis, according to which common nouns in the grammatical subject position are logical subject-terms or plural referring expressions, and show how it does explain that fact. The ability of competing theories of quantification to supply such an explanation is seen as one criterion for deciding between them.