What quantity am I saying here?
"3 million athletes, trainers and businesses use my product..."
Am I saying 3 million in total, or am I saying 9 million in total use my product (3M athletics + 3M trainers + 3M businesses).
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S L Bayer, in ... Events and Arguments in Compositional Semantics discusses the different (and sometimes conflicting) usages demanded of 'and'. He concludes that say
is ambiguous ... not because some people use 'and' constructions in idiosyncratic ways, but because the ways 'and' is used in 'Standard English' necessarily give rise to alternative interpretations.
An article by L Champollion top link here (reformatted) has:
... collectively interpreted conjunctions of plural nouns are in principle ambiguous as to the number of entities involved. So
- five men and women
can involve reference to a total of ten people, with five men and five women ... or (more likely) to a total of five people, with some men and some women among them.
The sentence needs rephrasing if clarity is paramount.