Nicole Gotzner, Jacopo Romoli and Paolo Santorio
to appear in Natural Language Semantics
Publication year: 2019

Disjunctions in the scope of possibility modals give rise to a con- junctive inference, generally referred to as ‘free choice.’ For example, Emma can take Spanish or Calculus suggests that Emma can take Spanish and can take Calculus. This inference is not valid on standard semantics for modals in combination with a Boolean semantics for disjunction. Hence free choice has sparked a whole industry of theories in philosophy of language and semantics. This paper investigates free choice in sentences involving a non-monotonic modified numeral, under which we embed a possibility modal scoping over disjunction. One examplke is Exactly one student can(not) take Spanish or Calculus. As we point out, the presence (or absence) of certain readings of these sentences is a key test for a prominent approach, which analyzes free choice as a kind of scalar implicature. We report on two experiments inves- tigating the readings of such sentences, using an inferential task. Our results are challenging for the implicature approach. We sketch two possible solutions within this approach, either adopting a different recent implicature algorithm, or exploring a different meaning for modified numerals with exactly. Both of them suffer from a variety of problems. We then discuss a third solution, which exploits a recent account of free choice based on homogeneity. This ap- proach can account for our results, in combination with plausible assumptions about homogeneity projection. Regardless of which solution is chosen, non- monotonic contexts turn out to be an important test case for theories of free choice, implicature, and modified numerals.