Comparatives can be modified by "much/a lot/far" like "much faster/a lot faster/far faster."
What about "fewer people"?
Is "much fewer people/ a lot fewer people/ far fewer people" possible?
"far fewer people" is fine. "much fewer people" sounds wrong to me. To my ear it should be "many fewer people".
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"far fewer people" is fine. "much fewer people" sounds wrong to me. To my ear it should be "many fewer people". However, having looked through some other discussions on the Internet, it seems that not everyone agrees. There is also a suggestion that "much fewer" used to be the norm. I would also say that "far fewer" sounds more extreme than "much/many fewer".
"a lot fewer" is OK in infor
There's nothing wrong with "much fewer people".
The word people is countable so it requires fewer (not less) but the phrasing "fewer people" is uncountable so,in turn, it needs much.
10 people, 20 people and so on (countable)
fewer people, 10 fewer people (uncountable)
"many fewer people" simply isn't possibl